Calculator-Free Challenge 9 / 10
Calculator-Free Challenge
A $50 price rises by 20%, then the new price falls by 20%. What is the final price?
About this quiz
Try ten calculations using only your head. Begin with quick additions and multiplication, then work through fractions, percentages, discounts and calculations with more than one step.
How to play
- 1 Try all ten in your head, without a calculator or written notes.
- 2 Pick one of four answers. Take your time: speed is not scored.
- 3 Finish to reveal your mental-math level and the worked solutions.
There is no timer. The challenge is keeping track of the numbers without writing them down. Finish to reveal your mental-math level and the shortcuts behind each answer.