How to find 18 percent of 20
"Percent" means per hundred, so 18% is the fraction 18/100, or 0.18 as a decimal. Taking 18 percent of 20 means multiplying 20 by that fraction:
18% of 20 = 20 x 18 / 100
= 360 / 100
= 3.6The same answer comes from the decimal form: 20 x 0.18 = 3.6. And because multiplication is commutative, 18% of 20 equals 20% of 18, 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 18% from those pieces: 1 x 2 + 8 x 0.2 = 3.6.
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 |
| 13% | 2.6 | 17.4 | 22.6 |
| 15% | 3 | 17 | 23 |
| 17% | 3.4 | 16.6 | 23.4 |
| 19% | 3.8 | 16.2 | 23.8 |
| 20% | 4 | 16 | 24 |
| 23% | 4.6 | 15.4 | 24.6 |
| 25% | 5 | 15 | 25 |
| 30% | 6 | 14 | 26 |
| 36% | 7.2 | 12.8 | 27.2 |
18 percent of other amounts
| Amount | 18% of it |
|---|---|
| 10 | 1.8 |
| 25 | 4.5 |
| 30 | 5.4 |
| 40 | 7.2 |
| 50 | 9 |
| 60 | 10.8 |
| 75 | 13.5 |
| 80 | 14.4 |
| 100 | 18 |
Where this comes up
A 18% discount on a 20 price takes off 3.6, leaving 16.4. A 18% tip or tax on 20 adds 3.6, for a total of 23.6. If 20 is a score out of a possible total, 18% of it is the share 3.6 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.