Flip the Percent

A% of B equals B% of A — pick whichever side is easier.

8% of 50 = 4

8% of 50 is 8 × 50 ÷ 100. Swap the factors and it reads 50% of 8.

50% of 8 is half of 8: 4. When the percent is ugly and the number friendly, flip.

Your turn

Three to try in your head — tap what you get.

20% of 50

10% of 50

6% of 50

Keep practicing free in Math Challenge

All 36 shortcuts: the Magic Tricks library.