Try these AMC 8 Number Theory Questions and check your knowledge!
AMC 8, 2022, Problem 13
How many positive integers can fill the blank in the sentence below?
"One positive integer is more than twice another, and the sum of the two numbers is
(A) 6
(B) 7
(C) 8
(D) 9
(E) 10
AMC 8, 2020, Problem 1
Luka is making lemonade to sell at a school fundraiser. His recipe requires 4 times as much water as sugar and twice as much sugar as lemon juice. He uses 3 cups of lemon juice. How many cups of water does he need?
(A) (B)
(C)
(D)
(E)
AMC 8, 2020, Problem 2
Four friends do yardwork for their neighbors over the weekend, earning and
respectively. They decide to split their earnings equally among themselves. In total how much will the friend who earned
give to the others?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 3
Carrie has a rectangular garden that measures feet by
feet. She plants the entire garden with strawberry plants. Carrie is able to plant
strawberry plants per square foot, and she harvests an average of
strawberries per plant. How many strawberries can she expect to harvest?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 5
Three fourths of a pitcher is filled with pineapple juice. The pitcher is emptied by pouring an equal amount of juice into each of cups. What percent of the total capacity of the pitcher did each cup receive?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 7
How many integers between and
have four distinct digits arranged in increasing order? (For example,
is one integer.)
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 13
Jamal has a drawer containing green socks,
purple socks, and
orange socks. After adding more purple socks, Jamal noticed that there is now a
chance that a sock randomly selected from the drawer is purple. How many purple socks did Jamal add?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 15
Suppose of
equals
of
What percentage of
is
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 17
How many factors of have more than
factors? (As an example,
has
factors, namely
and
(A)
(B)
(C)
(D)
(E)
AMC 8, 2020, Problem 19
A number is called flippy if its digits alternate between two distinct digits. For example, and
are flippy, but
and
are not. How many five-digit flippy numbers are divisible by
(A)
(B)
(C)
(D)
(E)
AMC 8, 2019, Problem 1
Ike and Mike go into a sandwich shop with a total of to spend. Sandwiches cost
each and soft drinks cost
each. Ike and Mike plan to buy as many sandwiches as they can and use the remaining money to buy soft drinks. Counting both soft drinks and sandwiches, how many items will they buy?
AMC 8, 2019, Problem 3
Which of the following is the correct order of the fractions ,
, and
, from least to greatest?
AMC 8, 2019, Problem 5
A tortoise challenges a hare to a race. The hare eagerly agrees and quickly runs ahead, leaving the slow-moving tortoise behind. Confident that he will win, the hare stops to take a nap. Meanwhile, the tortoise walks at a slow steady pace for the entire race. The hare awakes and runs to the finish line, only to find the tortoise already there. Which of the following graphs matches the description of the race, showing the distance traveled by the two animals over time
from start to finish?
AMC 8, 2019, Problem 6
There are grid points (uniformly spaced) in the square shown in the diagram below, including the points on the edges. Point
is in the center of the square. Given that point
is randomly chosen among the other
points, what is the probability that the line
is a line of symmetry for the square?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2019, Problem 7
Shauna takes five tests, each worth a maximum of 100 points. Her scores on the first three tests are and
. In order to average 81 for all five tests, what is the lowest score she could earn on one of the other two tests?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2019, Problem 8
Gilda has a bag of marbles. She gives of them to her friend Pedro. Then Gilda gives
of what is left to another friend, Ebony. Finally, Gilda gives
of what is now left in the bag to her brother Jimmy. What percentage of her original bag of marbles does Gilda have left for herself?
AMC 8, 2019, Problem 9
Alex and Felicia each have cats as pets. Alex buys cat food in cylindrical cans that are cm in diameter and
cm high. Felicia buys cat food in cylindrical cans that are
cm in diameter and
cm high. What is the ratio of the volume one of Alex's cans to the volume one of Felicia's cans?
AMC 8, 2019, Problem 10
The diagram shows the number of students at soccer practice each weekday during last week. After computing the mean and median values, Coach discovers that there were actually participants on Wednesday. Which of the following statements describes the change in the mean and median after the correction is made?
(A) The mean increases by and the median does not change.
(B) The mean increases by and the median increases by
.
(C) The mean increases by and the median increases by
.
(D) The mean increases by and the median increases by
.
(E) The mean increases by and the median increases by
.
AMC 8, 2019, Problem 11
The eighth grade class at Lincoln Middle School has students. Each student takes a math class or a foreign language class or both. There are
eighth graders taking a math class, and there are
eight graders taking a foreign language class. How many eight graders take only a math class and not a foreign language class?
AMC 8, 2019, Problem 13
A palindrome is a number that has the same value when read from left to right or from right to left. (For example 12321 is a palindrome.) Let be the least three-digit integer which is not a palindrome but which is the sum of three distinct two-digit palindromes. What is the sum of the digits of
?
AMC 8, 2019, Problem 14
Isabella has coupons that can be redeemed for free ice cream cones at Pete's Sweet Treats. In order to make the coupons last, she decides that she will redeem one every
days until she has used them all. She knows that Pete's is closed on Sundays, but as she circles the
dates on her calendar, she realizes that no circled date falls on a Sunday. On what day of the week does Isabella redeem her first coupon?
AMC 8, 2019, Problem 15
On a beach people are wearing sunglasses and
people are wearing caps. Some people are wearing both sunglasses and caps. If one of the people wearing a cap is selected at random, the probability that this person is is also wearing sunglasses is
. If instead, someone wearing sunglasses is selected at random, what is the probability that this person is also wearing a cap?
AMC 8, 2019, Problem 16
Qiang drives miles at an average speed of
miles per hour. How many additional miles will he have to drive at
miles per hour to average
miles per hour for the entire trip?
AMC 8, 2019, Problem 17
What is the value of the product
AMC 8, 2019, Problem 19
In a tournament there are six teams that play each other twice. A team earns points for a win,
point for a draw, and
points for a loss. After all the games have been played it turns out that the top three teams earned the same number of total points. What is the greatest possible number of total points for each of the top three teams?
AMC 8, 2019, Problem 22
A store increased the original price of a shirt by a certain percent and then decreased the new price by the same amount. Given that the resulting price was of the original price, by what percent was the price increased and decreased?
AMC 8, 2019, Problem 23
After Euclid High School's last basketball game, it was determined that of the team's points were scored by Alexa and
were scored by Brittany. Chelsea scored
points. None of the other
team members scored more than
points What was the total number of points scored by the other
team members?
AMC 8, 2018, Problem 1
An amusement park has a collection of scale models, with ratio , of buildings and other sights from around the country. The height of the United States Capitol is 289 feet. What is the height in feet of its replica to the nearest whole number?
AMC 8, 2018, Problem 2
What is the value of the product
AMC 8, 2018, Problem 3
Students Arn, Bob, Cyd, Dan, Eve, and Fon are arranged in that order in a circle. They start counting: Arn first, then Bob, and so forth. When the number contains a as a digit (such as
) or is a multiple of
that person leaves the circle and the counting continues. Who is the last one present in the circle?
(A) Arn
(B) Bob
(C) Cyd
(D) Dan
(E) Eve
AMC 8, 2018, Problem 5
What is the value of ?
AMC 8, 2018, Problem 6
On a trip to the beach, Anh traveled miles on the highway and
miles on a coastal access road. He drove three times as fast on the highway as on the coastal road. If Anh spent
minutes driving on the coastal road, how many minutes did his entire trip take?
AMC 8, 2018, Problem 7
The -digit number
is divisible by
. What is the remainder when this number is divided by
?
AMC 8, 2018, Problem 9
Tyler is tiling the floor of his foot by
foot living room. He plans to place one-foot by one-foot square tiles to form a border along the edges of the room and to fill in the rest of the floor with two-foot by two-foot square tiles. How many tiles will he use?
AMC 8, 2018, Problem 12
The clock in Sri's car, which is not accurate, gains time at a constant rate. One day as he begins shopping he notes that his car clock and his watch (which is accurate) both say 12:00 noon. When he is done shopping, his watch says 12:30 and his car clock says 12:35. Later that day, Sri loses his watch. He looks at his car clock and it says 7:00. What is the actual time?
AMC 8, 2018, Problem 13
Laila took five math tests, each worth a maximum of points. Laila's score on each test was an integer between
and
, inclusive. Laila received the same score on the first four tests, and she received a higher score on the last test. Her average score on the five tests was
. How many values are possible for Laila's score on the last test?
AMC 8, 2018, Problem 14
Let be the greatest five-digit number whose digits have a product of
. What is the sum of the digits of
?
AMC 8, 2018, Problem 17
Bella begins to walk from her house toward her friend Ella's house. At the same time, Ella begins to ride her bicycle toward Bella's house. They each maintain a constant speed, and Ella rides times as fast as Bella walks. The distance between their houses is
miles, which is
feet, and Bella covers
feet with each step. How many steps will Bella take by the time she meets Ella?
AMC 8, 2018, Problem 18
How many positive factors does have?
AMC 8, 2018, Problem 19
In a sign pyramid a cell gets a "+" if the two cells below it have the same sign, and it gets a "-" if the two cells below it have different signs. The diagram below illustrates a sign pyramid with four levels. How many possible ways are there to fill the four cells in the bottom row to produce a "+" at the top of the pyramid?
AMC 8, 2018, Problem 21
How many positive three-digit integers have a remainder of when divided by
, a remainder of
when divided by
, and a remainder of
when divided by
?
AMC 8, 2018, Problem 25
How many perfect cubes lie between and
, inclusive?
AMC 8, 2017, Problem 1
Which of the following values is the largest?
(A) (B)
(C)
(D)
(E)
AMC 8, 2017, Problem 2
Alicia, Brenda, and Colby were the candidates in a recent election for student president. The pie chart below shows how the votes were distributed among the three candidates. If Brenda received 36 votes, then how many votes were cast all together?
AMC 8, 2017, Problem 3
What is the value of the expression ?
AMC 8, 2017, Problem 4
When is multiplied by
the product is closest to which of the following?
AMC 8, 2017, Problem 5
What is the value of the expression ?
AMC 8, 2017, Problem 7
Let be a
-digit positive integer, such as
, whose first three digits are the same as its last three digits taken in the same order. Which of the following numbers must also be a factor of
?
AMC 8, 2017, Problem 8
Malcolm wants to visit Isabella after school today and knows the street where she lives but doesn't know her house number. She tells him, "My house number has two digits, and exactly three of the following four statements about it are true."
(1) It is prime.
(2) It is even.
(3) It is divisible by .
(4) One of its digits is .
This information allows Malcolm to determine Isabella's house number. What is its units digit?
AMC 8, 2017, Problem 9
All of Marcy's marbles are blue, red, green, or yellow. One third of her marbles are blue, one fourth of them are red, and six of them are green. What is the smallest number of yellow marbles?
AMC 8, 2017, Problem 11
A square-shaped floor is covered with congruent square tiles. If the total number of tiles that lie on the two diagonals is , how many tiles cover the floor?
AMC 8, 2017, Problem 12
The smallest positive integer greater than 1 that leaves a remainder of when divided by
, and
lies between which of the following pairs of numbers?
AMC 8, 2017, Problem 13
Peter, Emma, and Kyler played chess with each other. Peter won games and lost
games. Emma won
games and lost
games. If Kyler lost
games, how many games did he win?
AMC 8, 2017, Problem 14
Chloe and Zoe are both students in Ms. Demeanor's math class. Last night they each solved half of the problems in their homework assignment alone and then solved the other half together. Chloe had correct answers to only of the problems she solved alone, but overall
of her answers were correct. Zoe had correct answers to
of the problems she solved alone. What was Zoe's overall percentage of correct answers?
AMC 8, 2017, Problem 19
For any positive integer , the notation
denotes the product of the integers
through
. What is the largest integer
for which
is a factor of the sum
?
AMC 8, 2017, Problem 21
Suppose ,
, and
are nonzero real numbers, and
. What are the possible value(s) for
?
AMC 8, 2017, Problem 23
Each day for four days, Linda traveled for one hour at a speed that resulted in her traveling one mile in an integer number of minutes. Each day after the first, her speed decreased so that the number of minutes to travel one mile increased by 5 minutes over the preceding day. Each of the four days, her distance traveled was also an integer number of miles. What was the total number of miles for the four trips?
AMC 8, 2017, Problem 24
Mrs. Sanders has three grandchildren, who call her regularly. One calls her every three days, one calls her every four days, and one calls her every five days. All three called her on December On how many days during the next year did she not receive a phone call from any of her grandchildren?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2016, Problem 1
The longest professional tennis match lasted a total of 11 hours and 5 minutes. How many minutes was that?
AMC 8, 2016, Problem 4
When Cheenu was a boy he could run miles in
hours and
minutes. As an old man he can now walk
miles in
hours. How many minutes longer does it take for him to travel a mile now compared to when he was a boy?
AMC 8, 2016, Problem 5
The number is a two-digit number.
• When is divided by
, the remainder is
.
• When is divided by
, the remainder is
.
What is the remainder when is divided by
?
AMC 8, 2016, Problem 7
Which of the following numbers is not a perfect square?
AMC 8, 2016, Problem 8
Find the value of the expression
AMC 8, 2016, Problem 9
What is the sum of the distinct prime integer divisors of ?
AMC 8, 2016, Problem 10
Suppose that means
What is the value of
if
AMC 8, 2016, Problem 11
Determine how many two-digit numbers satisfy the following property: when the number is added to the number obtained by reversing its digits, the sum is
AMC 8, 2016, Problem 12
Jefferson Middle School has the same number of boys and girls. of the girls and
of the boys went on a field trip. What fraction of the students on the field trip were girls?
AMC 8, 2016, Problem 14
Karl's car uses a gallon of gas every miles, and his gas tank holds
gallons when it is full. One day, Karl started with a full tank of gas, drove
miles, bought
gallons of gas, and continued driving to his destination. When he arrived, his gas tank was half full. How many miles did Karl drive that day?
AMC 8, 2016, Problem 15
What is the largest power of that is a divisor of
?
AMC 8, 2016, Problem 16
Annie and Bonnie are running laps around a -meter oval track. They started together, but Annie has pulled ahead because she runs
faster than Bonnie. How many laps will Annie have run when she first passes Bonnie?
AMC 8, 2016, Problem 18
In an All-Area track meet, sprinters enter a
meter dash competition. The track has
lanes, so only
sprinters can compete at a time. At the end of each race, the five non-winners are eliminated, and the winner will compete again in a later race. How many races are needed to determine the champion sprinter?
AMC 8, 2016, Problem 19
The sum of consecutive even integers is
. What is the largest of these
consecutive integers?
AMC 8, 2016, Problem 20
The least common multiple of and
is
, and the least common multiple of
and
is
. What is the least possible value of the least common multiple of
and
?
AMC 8, 2016, Problem 24
The digits ,
,
,
, and
are each used once to write a five-digit number
. The three-digit number
is divisible by
, the three-digit number
is divisible by
, and the three-digit number
is divisible by
. What is
?
AMC 8, 2015, Problem 1
How many square yards of carpet are required to cover a rectangular floor that is feet long and
feet wide? (There are
feet in a yard.)
AMC 8, 2015, Problem 3
Jack and Jill are going swimming at a pool that is one mile from their house. They leave home simultaneously. Jill rides her bicycle to the pool at a constant speed of miles per hour. Jack walks to the pool at a constant speed of
miles per hour. How many minutes before Jack does Jill arrive?
AMC 8, 2015, Problem 8
What is the smallest whole number larger than the perimeter of any triangle with a side of length 5 and a side of length 19?
AMC 8, 2015, Problem 9
On her first day of work, Janabel sold one widget. On day two, she sold three widgets. On day three, she sold five widgets, and on each succeeding day, she sold two more widgets than she had sold on the previous day. How many widgets in total had Janabel sold after working days?
AMC 8, 2015, Problem 14
Which of the following integers cannot be written as the sum of four consecutive odd integers?
AMC 8, 2015, Problem 15
At Euler Middle School, students voted on two issues in a school referendum with the following results:
voted in favor of the first issue and
voted in favor of the second issue. If there were exactly
students who voted against both issues, how many students voted in favor of both issues?
AMC 8, 2015, Problem 16
In a middle-school mentoring program, a number of the sixth graders are paired with a ninth-grade student as a buddy. No ninth grader is assigned more than one sixth-grade buddy. If of all the ninth graders are paired with
of all the sixth graders, what fraction of the total number of sixth and ninth graders have a buddy?
AMC 8, 2015, Problem 17
Jeremy's father drives him to school in rush hour traffic in minutes. One day there is no traffic, so his father can drive him
miles per hour faster and gets him to school in
minutes. How far in miles is it to school?
AMC 8, 2015, Problem 18
An arithmetic sequence is a sequence in which each term after the first is obtained by adding a constant to the previous term. For example, is an arithmetic sequence with five terms, in which the first term is
and the constant added is
. Each row and each column in this
array is an arithmetic sequence with five terms. What is the value of
?
AMC 8, 2015, Problem 20
Ralph went to the store and bought pairs of socks for a total of
. Some of the socks he bought cost
a pair, some of the socks he bought cost
a pair, and some of the socks he bought cost
a pair. If he bought at least one pair of each type, how many pairs of
socks did Ralph buy?
AMC 8, 2015, Problem 23
Tom has twelve slips of paper which he wants to put into five cups labeled ,
,
,
,
. He wants the sum of the numbers on the slips in each cup to be an integer. Furthermore, he wants the five integers to be consecutive and increasing from
to
. The numbers on the papers are
and
. If a slip with
goes into cup
and a slip with
goes into cup
, then the slip with
must go into what cup?
AMC 8, 2014, Problem 1
Harry and Terry are each told to calculate . Harry gets the correct answer. Terry ignores the parentheses and calculates
. If Harry's answer is
and Terry's answer is
, what is
?
AMC 8, 2014, Problem 2
Paul owes Paula 35 cents and has a pocket full of 5-cent coins, 10-cent coins, and 25-cent coins that he can use to pay her. What is the difference between the largest and the smallest number of coins he can use to pay her?
AMC 8, 2014, Problem 3
Isabella had a week to read a book for a school assignment. She read an average of 36 pages per day for the first three days and an average of 44 pages per day for the next three days. She then finished the book by reading 10 pages on the last day. How many pages were in the book?
AMC 8, 2014, Problem 4
The sum of two prime numbers is . What is the product of these two prime numbers?
AMC 8, 2014, Problem 5
Margie's car can go miles on a gallon of gas, and gas currently costs
per gallon. How many miles can Margie drive on
?
AMC 8, 2014, Problem 7
There are four more girls than boys in Ms. Raub's class of 28 students. What is the ratio of number of girls to the number of boys in her class?
AMC 8, 2014, Problem 8
Eleven members of the Middle School Math Club each paid the same integer amount for a guest speaker to talk about problem solving at their math club meeting. In all, they paid their guest speaker . What is the missing digit A of this 3-digit number?
AMC 8, 2014, Problem 9
The first AMC 8 was given in 1985 and it has been given annually since that time. Samantha turned 12 years old the year that she took the seventh AMC 8. In what year was Samantha born?
AMC 8, 2014, Problem 13
If and
are integers and
is even, which of the following is impossible?
and
are even
and
are odd
is even
is odd
none of these are impossible
AMC 8, 2014, Problem 17
George walks mile to school. He leaves home at the same time each day, walks at a steady speed of
miles per hour, and arrives just as school begins. Today he was distracted by the pleasant weather and walked the first
mile at a speed of only
miles per hour. At how many miles per hour must George run the last
mile in order to arrive just as school begins today?
AMC 8, 2014, Problem 19
A cube with 3-inch edges is to be constructed from 27 smaller cubes with 1-inch edges. Twenty-one of the cubes are colored red and 6 are colored white. If the 3-inch cube is constructed to have the smallest possible white surface area showing, what fraction of the surface area is white?
AMC 8, 2014, Problem 21
The 7-digit numbers and
are each multiples of 3. Which of the following could be the value of
?
AMC 8, 2014, Problem 22
A 2-digit number is such that the product of the digits plus the sum of the digits is equal to the number. What is the units digit of the number?
AMC 8, 2014, Problem 23
Three members of the Euclid Middle School girls' softball team had the following conversation.
Ashley: I just realized that our uniform numbers are all 2-digit primes.
Bethany: And the sum of your two uniform numbers is the date of my birthday earlier this month.
Caitlin: That's funny. The sum of your two uniform numbers is the date of my birthday later this month.
Ashley: And the sum of your two uniform numbers is today's date.
What number does Caitlin wear?
AMC 8, 2014, Problem 25
A straight one-mile stretch of highway, 40 feet wide, is closed. Robert rides his bike on a path composed of semicircles as shown. If he rides at 5 miles per hour, how many hours will it take to cover the one-mile stretch?
Note: 1 mile= 5280 feet
AMC 8, 2013, Problem 1
Danica wants to arrange her model cars in rows with exactly 6 cars in each row. She now has 23 model cars. What is the smallest number of additional cars she must buy in order to be able to arrange all her cars this way?
AMC 8, 2013, Problem 2
A sign at the fish market says, "50% off, today only: half-pound packages for just \textbf{(A)}\ 6 \qquad \textbf{(B)}\ 9 \qquad \textbf{(C)}\ 10 \qquad \textbf{(D)}\ 12 \qquad \textbf{(E)}\ 15
4 \cdot (-1+2-3+4-5+6-7+\cdots+1000)
\textbf{(A)}\ -10 \qquad \textbf{(B)}\ 0 \qquad \textbf{(C)}\ 1 \qquad \textbf{(D)}\ 500 \qquad \textbf{(E)}\ 2000
2.50 to cover her portion of the total bill. What was the total bill?
AMC 8, 2013, Problem 6
The number in each box below is the product of the numbers in the two boxes that touch it in the row above. For example, . What is the missing number in the top row?
(A) (B)
(C)
(D)
(E)
AMC 8, 2013, Problem 7
rey and his mom stopped at a railroad crossing to let a train pass. As the train began to pass, Trey counted 6 cars in the first 10 seconds. It took the train 2 minutes and 45 seconds to clear the crossing at a constant speed. Which of the following was the most likely number of cars in the train?
AMC 8, 2013, Problem 9
The Incredible Hulk can double the distance it jumps with each succeeding jump. If its first jump is 1 meter, the second jump is 2 meters, the third jump is 4 meters, and so on, then on which jump will it first be able to jump more than 1 kilometer?
AMC 8, 2013, Problem 10
What is the ratio of the least common multiple of 180 and 594 to the greatest common factor of 180 and 594?
AMC 8, 2013, Problem 11
Ted's grandfather used his treadmill on 3 days this week. He went 2 miles each day. On Monday he jogged at a speed of 5 miles per hour. He walked at the rate of 3 miles per hour on Wednesday and at 4 miles per hour on Friday. If Grandfather had always walked at 4 miles per hour, he would have spent less time on the treadmill. How many minutes less?
AMC 8, 2013, Problem 12
At the 2013 Winnebago County Fair a vendor is offering a "fair special" on sandals. If you buy one pair of sandals at the regular price of , you get a second pair at a 40% discount, and a third pair at half the regular price. Javier took advantage of the "fair special" to buy three pairs of sandals. What percentage of the
regular price did he save?
AMC 8, 2013, Problem 13
When Clara totaled her scores, she inadvertently reversed the units digit and the tens digit of one score. By which of the following might her incorrect sum have differed from the correct one?
AMC 8, 2013, Problem 15
If ,
, and
, what is the product of
,
, and
?
AMC 8, 2013, Problem 16
A number of students from Fibonacci Middle School are taking part in a community service project. The ratio of -graders to
-graders is
, and the ratio of
-graders to
-graders is
. What is the smallest number of students that could be participating in the project?
AMC 8, 2013, Problem 17
The sum of six consecutive positive integers is 2013. What is the largest of these six integers?
AMC 8, 2013, Problem 19
Bridget, Cassie, and Hannah are discussing the results of their last math test. Hannah shows Bridget and Cassie her test, but Bridget and Cassie don't show theirs to anyone. Cassie says, 'I didn't get the lowest score in our class,' and Bridget adds, 'I didn't get the highest score.' What is the ranking of the three girls from the highest score to the lowest score?
(A) Hannah, Cassie, Bridget
(B) Hannah, Bridget, Cassie
(C) Cassie, Bridget, Hannah
(D) Cassie, Hannah, Bridget
(E) Bridget, Cassie, Hannah
AMC 8, 2013, Problem 21
Samantha lives 2 blocks west and 1 block south of the southwest corner of City Park. Her school is 2 blocks east and 2 blocks north of the northeast corner of City Park. On school days she bikes on streets to the southwest corner of City Park, then takes a diagonal path through the park to the northeast corner, and then bikes on streets to school. If her route is as short as possible, how many different routes can she take?
AMC 8, 2012, Problem 1
Rachelle uses pounds of meat to make
hamburgers for her family. How many pounds of meat does she need to make
hamburgers for a neighborhood picnic?
AMC 8, 2012, Problem 2
In the country of East Westmore, statisticians estimate there is a baby born every hours and a death every day. To the nearest hundred, how many people are added to the population of East Westmore each year?
AMC 8, 2012, Problem 3
On February 13 The Oshkosh Northwester listed the length of daylight as 10 hours and 24 minutes, the sunrise was , and the sunset as
. The length of daylight and sunrise were correct, but the sunset was wrong. When did the sun really set?
AMC 8, 2012, Problem 4
Peter's family ordered a 12-slice pizza for dinner. Peter ate one slice and shared another slice equally with his brother Paul. What fraction of the pizza did Peter eat?
AMC 8, 2012, Problem 8
A shop advertises everything is "half price in today's sale." In addition, a coupon gives a 20% discount on sale prices. Using the coupon, the price today represents what percentage off the original price?
AMC 8, 2012, Problem 9
The Fort Worth Zoo has a number of two-legged birds and a number of four-legged mammals. On one visit to the zoo, Margie counted 200 heads and 522 legs. How many of the animals that Margie counted were two-legged birds?
AMC 8, 2012, Problem 10
How many 4-digit numbers greater than 1000 are there that use the four digits of 2012?
AMC 8, 2012, Problem 12
What is the units digit of ?
AMC 8, 2012, Problem 13
Jamar bought some pencils costing more than a penny each at the school bookstore and paid . Sharona bought some of the same pencils and paid
. How many more pencils did Sharona buy than Jamar?
AMC 8, 2012, Problem 15
The smallest number greater than 2 that leaves a remainder of 2 when divided by 3, 4, 5, or 6 lies between what numbers?
AMC 8, 2012, Problem 16
Each of the digits and
is used only once to make two five-digit numbers so that they have the largest possible sum. Which of the following could be one of the numbers?
(A) (B)
(C)
(D)
(E)
AMC 8, 2012, Problem 18
What is the smallest positive integer that is neither prime nor square and that has no prime factor less than
(A)
(B)
(C)
(D)
(E)
AMC 8, 2012, Problem 19
In a jar of red, green, and blue marbles, all but 6 are red marbles, all but 8 are green, and all but 4 are blue. How many marbles are in the jar?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2012, Problem 20
What is the correct ordering of the three numbers , and
, in increasing order?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2012, Problem 22
Let be a set of nine distinct integers. Six of the elements are
and
What is the number of possible values of the median of
?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 1
Margie bought apples at a cost of
cents per apple. She paid with a
-dollar bill. How much change did Margie receive?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 3
Extend the square pattern of black and
white square tiles by attaching a border of black tiles around the square. What is the ratio of black tiles to white tiles in the extended pattern?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 6
In a town of 351 adults, every adult owns a car, motorcycle, or both. If 331 adults own cars and 45 adults own motorcycles, how many of the car owners do not own a motorcycle?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 14
There are students at Colfax Middle School, where the ratio of boys to girls is
. There are
students at Winthrop Middle School, where the ratio of boys to girls is
. The two schools hold a dance and all students from both schools attend. What fraction of the students at the dance are girls?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 15
How many digits are in the product
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 22
What is the tens digit of ?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2011, Problem 23
How many -digit positive integers have four different digits, where the leading digit is not zero, the integer is a multiple of
and
is the largest digit?
(A)
(B)
(C)
(D)
(E) 10810001
0
1
2
3
4
11
8
9
26
27
28
29
30
10
2.4
1.5
46
32
34
36
38
40
6
10
15
25
99
1 / 2
1 / 2
6
8
12
15
16
80 \%
25
90 \%
40
70 \%
10
64
75
80
84
86
\frac{1}{2}
\frac{2}{3}
\frac{3}{4}
\frac{5}{6}
\frac{7}{8}
16
3: 4
48
64
80
96
112
500
80 \%
75 \%
25
50
75
100
150
30 \%
7
8
9
10
11
2010 ?
67
75
77
201
210
5
30 \%
20 \%
15 \%
10 \%
30
35
36
42
48
64
2 / 5
3 / 4
3
5
8
15
20
1 / 5
1 / 4
1 / 3
120
180
240
300
360
2
0
2
4
6
8
10^{8}, 5^{12}
2^{24} ?
2^{24}<10^{8}<5^{12}
2^{24}<5^{12}<10^{8}
5^{12}<2^{24}<10^{8}
10^{8}<5^{12}<2^{24}
10^{8}<2^{24}<5^{12}
1,2,
3
1
2
13
18
20
22
24
3
4
3
4
7
11
14
7
32
35
49
112
5
5.5
6
6.5
7
1,2,
3
1+2+3=6
11
20
37
68
99
24,000
4
2.5
40
42
44
46
48
10 \%
10 \%
90
99
100
101
110
1.43
30
1.95
1
2
3
4
5
50
35
60
40
46
48
50
52
54
5
2
\frac{1}{4}
1
4
5
2
7
5 \frac{1}{8}
6 \frac{1}{4}
7 \frac{1}{2}
8 \frac{3}{4}
9 \frac{7}{8}
x
y
360
x
360
y
x
y
80
85
115
165
610
7
7
1
15
15
49
57
64
96
126
1
1000
1 ?
512
648
720
728
800
400
26
28
30
32
34
A, B, C
D
D
5
6
7
8
9
50
12
12
14
26
38
50
0-9
4
8671
8672
9781
9782
9872
13^{\text {th }}
1 ?
3
4
5
6
7
1441
4
6
1661
15
16
18
20
22
3: 10
3: 8
3: 7
3: 5
1: 1
60
70
75
80
85
6
\mathrm{A}
40 .
4
\mathrm{B}
32.5
33
33.5
34
35
39
26
7
13
19
39
46
3
2
\frac{2}{3}
0.5
3
4
5
6
7
100
150
122,125
127
160
170
187
195
354
n
\frac{n}{3}
3 n
12
21
27
33
34
10
6
5
8,11,7,12
10
9
10
11
12
13
650
\frac{2}{5}
\frac{1}{2}
\frac{5}{4}
\frac{5}{3}
\frac{5}{2}
250
2
5
7
10
12
1985
41
2005
7
7
17
34
41
80
5
30
18
25
26
29
33
36
n
n
n
6=1+2+3+6=12
11
13
20
24
28
30
1: 1
6: 5
3: 2
2: 1
3: 1
A
B
A
503
1006
1504
1507
1510
a, b
c
0<a<b<c
a+c<b
a \cdot b<c
a+b<c
a \cdot c<b
\frac{b}{c}=a
30
25 \%
30 \%
45 \%
25
35
40
45
50
10
6.2
90
2
2
4.5
5
6.2
7
$ 1.98, $ 5.04,
$ 9.89
10
15
16
17
18
13
7
5 .
\mathrm{N} / \mathrm{A}=+0)
1
6
13
19
26
10
25
12
24
\frac{1}{2}
\frac{3}{4}
1
2
3
39
48
52
55
75
\frac{3}{2} \times \frac{4}{3} \times \frac{5}{4} \times \cdots \times \frac{2006}{2005} ?
1
1002
1003
2005
2006
13
16
17
18
19
70 \%
10
80 \%
20
90 \%
30
60
40
77
80
83
87
8: 30
12
9: 00
62
10: 00
10: 15
10: 30
11: 00
11: 30
760
20
45
30
7,600
11,400
12,500
15,200
22,800
1
760
425
444
456
484
506
6400
6600
6800
7000
7200
13
14
15
16
17
2
60
2
7.5
15
30
120
240
$ 2.50
20\%
$ 1.00
$ 2.00
$ 2.50
$ 2.75
$ 5.00
6.1 \mathrm{~cm}, 8.2 \mathrm{~cm}
9.7 \mathrm{~cm}
24
25
36
48
64
6,12
24
90
4
5
6
8
15
d
d
2.00 d 5>2.005 ?
0
4
5
6
10
\frac{1}{2}
\frac{3}{4}
\frac{1}{2}
1
1 \frac{1}{4}
1 \frac{1}{2}
1 \frac{3}{4}
2
m
n
m+3 n
3 m-n
3 m^{2}+3 n^{2}
(n m+3)^{2}
3 \mathrm{mn}
3
6
7
7.3
7.7
8
8.3
6 \% .
20 \%
$ 90.00
$ 90.00
6 \%
20 \%
$ 90.00,
20 \%
6 \%
-$ 1.06
-$ 0.53
0
$ 0.53
$ 1.06
100
1
5
5
20
22
30
32
34
80
96
100
108
192
23 ?
2
4
6
9
11
5
6
9
12
13
15
13 ?
7
67
69
76
77
12
72
17
6
102
204
864
1224
2004 ?
4
6
16
24
81
12
8
9
10
15
18
20
55 \%
5
56 \%
5
1
2
3
4
5
80 \%
5
7
11
12
18
600 \mathrm{~mL}
1 / 3
2 / 5
\frac{1}{8}
\frac{3}{16}
\frac{11}{30}
\frac{11}{19}
\frac{11}{15}
2
2
3,4,5,
6
40
49
60
79
100
129
210
249
320
369
\frac{2}{5} .
\frac{1}{3}
\frac{3}{8}
\frac{2}{5}
\frac{5}{12}
\frac{3}{5}
12
16
20
22
26
55
57
58
59
61
60 \%
65 \%
70 \%
75 \%
90 \%
120
30
60 \%
65 \%
70 \%
75 \%
90 \%
7
19
2
4
5
6
7
20 \%
12,
30 \%
15
18
20
24
30
100
10
10
10
15
20
25
40
12
60
18
25
40
75
90
10 \%
40
36
39.60
40
40.40
44
1000
2000
15,20,
25
1
2
3
4
5
4: 20 \mathrm{PM}
0
5
8
10
12
2002
2002
0
4
9
16
25
125
250
500
625
750
1000
30 \%
20 \%
50 \%
35 \%
44 \%
50 \%
56 \%
60 \%
1 \mathrm{hr}
10 \mathrm{~min}
20 \mathrm{~min}
1 \mathrm{hr} 40 \mathrm{~min}
2 \mathrm{hr}
99
999
72
90
144
162
180
\frac{1}{3}
\frac{4}{9}
\frac{1}{2}
\frac{5}{9}
\frac{5}{8}
8
3
2
30
40
50
60
70
\frac{1}{10}
\frac{1}{4}
\frac{1}{3}
\frac{2}{5}
\frac{1}{2}
300
2
4
6
8
10
12
24
11
3
4
6
8
12
$ 63
$ 2
17
18
19
21
23
1,2,3,4
9
1
2
3
4
9
1
1 \frac{1}{2}
2
2 \frac{1}{2}
3
90
100
105
120
140
21
22
23
24
25
30
32
35
38
39
63
72
180
(E)
AMC 8, 2001, Problem 10
A collector offers to buy state quarters for of their face value. At that rate how much will Bryden get for his four state quarters?
(A) dollars
(B) dollars
(C) dollars
(D) dollars
(E) dollars
AMC 8, 2001, Problem 13
Of the 36 students in Richelle's class, 12 prefer chocolate pie, 8 prefer apple, and 6 prefer blueberry. Half of the remaining students prefer cherry pie and half prefer lemon. For Richelle's pie graph showing this data, how many degrees should she use for cherry pie?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2001, Problem 15
Homer began peeling a pile of potatoes at the rate of
potatoes per minute. Four minutes later Christen joined him and peeled at the rate of
potatoes per minute. When they finished, how many potatoes had Christen peeled?
(A)
(B)
(C)
(D)
(E)
AMC 8, 2001, Problem 25
There are four-digit whole numbers that use each of the four digits
and
exactly once. Only one of these four-digit numbers is a multiple of another one. Which of the following is it?
(A)
(B)
(C)
(D)
(E)