Mental math with percents There are some simple tricks for doing percents problems using mental math. So the 473 will become 480 and 658 660. Next add 480 660 1140.
2 If a shirt costs 20 and is reduced by 20 how much will the new price be.
Become a genius in no time. 4 95 of people in my street have a car. There are some percentages that are easy to calculate mentally. His surprisingly simple solution has now gone viral and left a lot of people wondering why it wasnt taught at school.