How 9 Cheenta students ranked in top 100 in ISI and CMI Entrances?
Learn More

Math Game - Australian Mathematics Competition, 2014

Problem - Math Game (AMC UP - 15)

Sally thinks of a number, multiplies it by 2, adds 2, divides by 2 and then subtracts 2. Her answer is 2. What was her original number?

  • 1
  • 2
  • 3
  • 5

Key Concepts

Math Game


Missing Number

Check the Answer

Answer: 3

Australian Mathematics Competition Upper Primary

2014 UP 15

Secrets of Mental Math - Arthur T. Benjamin

Try with Hints

This sum is a tricky one. You can play game with this sum too

First we can start with a diagram where the number by which we are starting is X (assume).

In Hint 1 its clear that how to solve this problem.Try this ....

But if you really want a final hint then we have to solve it in reverse.Lets See another picture.

So the answer is 3.

Subscribe to Cheenta at Youtube

Knowledge Partner

Cheenta is a knowledge partner of Aditya Birla Education Academy

Cheenta Academy

Aditya Birla Education Academy

Aditya Birla Education Academy

Cheenta. Passion for Mathematics

Advanced Mathematical Science. Taught by olympians, researchers and true masters of the subject.