How to find 20 percent of 100
"Percent" means per hundred, so 20% is the fraction 20/100, or 0.2 as a decimal. Taking 20 percent of 100 means multiplying 100 by that fraction:
20% of 100 = 100 x 20 / 100
= 2,000 / 100
= 20The same answer comes from the decimal form: 100 x 0.2 = 20. And because multiplication is commutative, 20% of 100 equals 100% of 20, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 100 is 10 (move the decimal one place left), and 1% is 1. Build 20% from those pieces: 2 x 10 = 20.
Nearby percentages of 100
| Percent | Of 100 | 100 minus it | 100 plus it |
|---|---|---|---|
| 1% | 1 | 99 | 101 |
| 5% | 5 | 95 | 105 |
| 10% | 10 | 90 | 110 |
| 15% | 15 | 85 | 115 |
| 19% | 19 | 81 | 119 |
| 21% | 21 | 79 | 121 |
| 25% | 25 | 75 | 125 |
| 30% | 30 | 70 | 130 |
| 40% | 40 | 60 | 140 |
| 50% | 50 | 50 | 150 |
| 75% | 75 | 25 | 175 |
20 percent of other amounts
| Amount | 20% of it |
|---|---|
| 20 | 4 |
| 25 | 5 |
| 30 | 6 |
| 40 | 8 |
| 50 | 10 |
| 60 | 12 |
| 75 | 15 |
| 80 | 16 |
| 120 | 24 |
| 150 | 30 |
Where this comes up
A 20% discount on a 100 price takes off 20, leaving 80. A 20% tip or tax on 100 adds 20, for a total of 120. If 100 is a score out of a possible total, 20% of it is the share 20 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.