How to find 15 percent of 40
"Percent" means per hundred, so 15% is the fraction 15/100, or 0.15 as a decimal. Taking 15 percent of 40 means multiplying 40 by that fraction:
15% of 40 = 40 x 15 / 100
= 600 / 100
= 6The same answer comes from the decimal form: 40 x 0.15 = 6. And because multiplication is commutative, 15% of 40 equals 40% of 15, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 40 is 4 (move the decimal one place left), and 1% is 0.4. Build 15% from those pieces: 1 x 4 + 5 x 0.4 = 6.
Nearby percentages of 40
| Percent | Of 40 | 40 minus it | 40 plus it |
|---|---|---|---|
| 1% | 0.4 | 39.6 | 40.4 |
| 5% | 2 | 38 | 42 |
| 10% | 4 | 36 | 44 |
| 14% | 5.6 | 34.4 | 45.6 |
| 16% | 6.4 | 33.6 | 46.4 |
| 20% | 8 | 32 | 48 |
| 25% | 10 | 30 | 50 |
| 30% | 12 | 28 | 52 |
| 50% | 20 | 20 | 60 |
| 75% | 30 | 10 | 70 |
15 percent of other amounts
| Amount | 15% of it |
|---|---|
| 10 | 1.5 |
| 20 | 3 |
| 25 | 3.75 |
| 30 | 4.5 |
| 50 | 7.5 |
| 60 | 9 |
| 75 | 11.25 |
| 80 | 12 |
| 100 | 15 |
| 120 | 18 |
Where this comes up
A 15% discount on a 40 price takes off 6, leaving 34. A 15% tip or tax on 40 adds 6, for a total of 46. If 40 is a score out of a possible total, 15% of it is the share 6 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.