How to find 10 percent of 100
"Percent" means per hundred, so 10% is the fraction 10/100, or 0.1 as a decimal. Taking 10 percent of 100 means multiplying 100 by that fraction:
10% of 100 = 100 x 10 / 100
= 1,000 / 100
= 10The same answer comes from the decimal form: 100 x 0.1 = 10. And because multiplication is commutative, 10% of 100 equals 100% of 10, 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 10% from those pieces: 1 x 10 = 10.
Nearby percentages of 100
| Percent | Of 100 | 100 minus it | 100 plus it |
|---|---|---|---|
| 1% | 1 | 99 | 101 |
| 5% | 5 | 95 | 105 |
| 9% | 9 | 91 | 109 |
| 11% | 11 | 89 | 111 |
| 15% | 15 | 85 | 115 |
| 20% | 20 | 80 | 120 |
| 25% | 25 | 75 | 125 |
| 30% | 30 | 70 | 130 |
| 50% | 50 | 50 | 150 |
| 75% | 75 | 25 | 175 |
10 percent of other amounts
| Amount | 10% of it |
|---|---|
| 20 | 2 |
| 25 | 2.5 |
| 30 | 3 |
| 40 | 4 |
| 50 | 5 |
| 60 | 6 |
| 75 | 7.5 |
| 80 | 8 |
| 120 | 12 |
| 150 | 15 |
Where this comes up
A 10% discount on a 100 price takes off 10, leaving 90. A 10% tip or tax on 100 adds 10, for a total of 110. If 100 is a score out of a possible total, 10% of it is the share 10 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.