How to find 18 percent of 40
"Percent" means per hundred, so 18% is the fraction 18/100, or 0.18 as a decimal. Taking 18 percent of 40 means multiplying 40 by that fraction:
18% of 40 = 40 x 18 / 100
= 720 / 100
= 7.2The same answer comes from the decimal form: 40 x 0.18 = 7.2. And because multiplication is commutative, 18% of 40 equals 40% of 18, 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 18% from those pieces: 1 x 4 + 8 x 0.4 = 7.2.
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 |
| 13% | 5.2 | 34.8 | 45.2 |
| 15% | 6 | 34 | 46 |
| 17% | 6.8 | 33.2 | 46.8 |
| 19% | 7.6 | 32.4 | 47.6 |
| 20% | 8 | 32 | 48 |
| 23% | 9.2 | 30.8 | 49.2 |
| 25% | 10 | 30 | 50 |
| 30% | 12 | 28 | 52 |
| 36% | 14.4 | 25.6 | 54.4 |
18 percent of other amounts
| Amount | 18% of it |
|---|---|
| 10 | 1.8 |
| 20 | 3.6 |
| 25 | 4.5 |
| 30 | 5.4 |
| 50 | 9 |
| 60 | 10.8 |
| 75 | 13.5 |
| 80 | 14.4 |
| 100 | 18 |
| 120 | 21.6 |
Where this comes up
A 18% discount on a 40 price takes off 7.2, leaving 32.8. A 18% tip or tax on 40 adds 7.2, for a total of 47.2. If 40 is a score out of a possible total, 18% of it is the share 7.2 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.