How to find 50 percent of 20
"Percent" means per hundred, so 50% is the fraction 50/100, or 0.5 as a decimal. Taking 50 percent of 20 means multiplying 20 by that fraction:
50% of 20 = 20 x 50 / 100
= 1,000 / 100
= 10The same answer comes from the decimal form: 20 x 0.5 = 10. And because multiplication is commutative, 50% of 20 equals 20% of 50, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 20 is 2 (move the decimal one place left), and 1% is 0.2. Build 50% from those pieces: 5 x 2 = 10.
Nearby percentages of 20
| Percent | Of 20 | 20 minus it | 20 plus it |
|---|---|---|---|
| 1% | 0.2 | 19.8 | 20.2 |
| 5% | 1 | 19 | 21 |
| 10% | 2 | 18 | 22 |
| 15% | 3 | 17 | 23 |
| 20% | 4 | 16 | 24 |
| 25% | 5 | 15 | 25 |
| 30% | 6 | 14 | 26 |
| 45% | 9 | 11 | 29 |
| 49% | 9.8 | 10.2 | 29.8 |
| 51% | 10.2 | 9.8 | 30.2 |
| 55% | 11 | 9 | 31 |
| 75% | 15 | 5 | 35 |
50 percent of other amounts
| Amount | 50% of it |
|---|---|
| 10 | 5 |
| 25 | 12.5 |
| 30 | 15 |
| 40 | 20 |
| 50 | 25 |
| 60 | 30 |
| 75 | 37.5 |
| 80 | 40 |
| 100 | 50 |
Where this comes up
A 50% discount on a 20 price takes off 10, leaving 10. A 50% tip or tax on 20 adds 10, for a total of 30. If 20 is a score out of a possible total, 50% of it is the share 10 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.