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# At a Glance - Estimating Percentages

Most of the time in life, you will estimate percents. You probably won’t bust out a pen and paper every time you need to pay a tip or figure out the discount on a shirt. If you get good at estimating percents, you’ll get close enough.

The first thing to do is round the amount to a nice easy number to work with.

## Shortcuts for Estimating Percentages

%Trick Round Amount Estimate
10% Move the decimal one place to the left \$72.38 -> \$70.00
\$58.20 -> \$60.00
\$26.00 -> \$25.00
10% of \$70.00 is \$7.00
10% of \$60.00 is \$6.00
10% of \$25.00 is \$2.50
20% Double 10% \$72.38 -> \$70.00
\$58.20 -> \$60.00
\$26.00 -> \$25.00
20% of \$75.00 is \$15.00
20% of \$60.00 is \$12.00
20% of \$25.00 is \$5.00
25%Round amount to a number divisible by 4, then divide the amount in fourths\$72.38 -> \$72.00
\$58.20 -> \$60.00
\$26.00 -> \$28.00
25% of \$72.00 is \$18.00
25% of \$60.00 is \$15.00
25% of \$28.00 is \$7.00
50% Cut the amount in half \$72.38 -> \$72.00
\$58.20 -> \$60.00
\$28.00 -> \$28.00
50% of \$72.00 is \$36.00
50% of \$60.00 is \$30.00
50% of \$28.00 is \$14.00

Do the following problems in your head. Feel free to round the numbers.

10% of \$92.86

50% of \$131.90

25% of \$76.75

20% of \$14.09