How to find 8 percent of 40
"Percent" means per hundred, so 8% is the fraction 8/100, or 0.08 as a decimal. Taking 8 percent of 40 means multiplying 40 by that fraction:
8% of 40 = 40 x 8 / 100
= 320 / 100
= 3.2The same answer comes from the decimal form: 40 x 0.08 = 3.2. And because multiplication is commutative, 8% of 40 equals 40% of 8, 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 8% from those pieces: 8 x 0.4 = 3.2.
Nearby percentages of 40
| Percent | Of 40 | 40 minus it | 40 plus it |
|---|---|---|---|
| 1% | 0.4 | 39.6 | 40.4 |
| 3% | 1.2 | 38.8 | 41.2 |
| 5% | 2 | 38 | 42 |
| 7% | 2.8 | 37.2 | 42.8 |
| 9% | 3.6 | 36.4 | 43.6 |
| 10% | 4 | 36 | 44 |
| 13% | 5.2 | 34.8 | 45.2 |
| 15% | 6 | 34 | 46 |
| 16% | 6.4 | 33.6 | 46.4 |
| 20% | 8 | 32 | 48 |
| 25% | 10 | 30 | 50 |
| 30% | 12 | 28 | 52 |
8 percent of other amounts
| Amount | 8% of it |
|---|---|
| 10 | 0.8 |
| 20 | 1.6 |
| 25 | 2 |
| 30 | 2.4 |
| 50 | 4 |
| 60 | 4.8 |
| 75 | 6 |
| 80 | 6.4 |
| 100 | 8 |
| 120 | 9.6 |
Where this comes up
A 8% discount on a 40 price takes off 3.2, leaving 36.8. A 8% tip or tax on 40 adds 3.2, for a total of 43.2. If 40 is a score out of a possible total, 8% of it is the share 3.2 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.