How to find 40 percent of 20
"Percent" means per hundred, so 40% is the fraction 40/100, or 0.4 as a decimal. Taking 40 percent of 20 means multiplying 20 by that fraction:
40% of 20 = 20 x 40 / 100
= 800 / 100
= 8The same answer comes from the decimal form: 20 x 0.4 = 8. And because multiplication is commutative, 40% of 20 equals 20% of 40, 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 40% from those pieces: 4 x 2 = 8.
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 |
| 35% | 7 | 13 | 27 |
| 39% | 7.8 | 12.2 | 27.8 |
| 41% | 8.2 | 11.8 | 28.2 |
| 45% | 9 | 11 | 29 |
| 50% | 10 | 10 | 30 |
40 percent of other amounts
| Amount | 40% of it |
|---|---|
| 10 | 4 |
| 25 | 10 |
| 30 | 12 |
| 40 | 16 |
| 50 | 20 |
| 60 | 24 |
| 75 | 30 |
| 80 | 32 |
| 100 | 40 |
Where this comes up
A 40% discount on a 20 price takes off 8, leaving 12. A 40% tip or tax on 20 adds 8, for a total of 28. If 20 is a score out of a possible total, 40% of it is the share 8 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.