How to find 9 percent of 20
"Percent" means per hundred, so 9% is the fraction 9/100, or 0.09 as a decimal. Taking 9 percent of 20 means multiplying 20 by that fraction:
9% of 20 = 20 x 9 / 100
= 180 / 100
= 1.8The same answer comes from the decimal form: 20 x 0.09 = 1.8. And because multiplication is commutative, 9% of 20 equals 20% of 9, 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 9% from those pieces: 9 x 0.2 = 1.8.
Nearby percentages of 20
| Percent | Of 20 | 20 minus it | 20 plus it |
|---|---|---|---|
| 1% | 0.2 | 19.8 | 20.2 |
| 4% | 0.8 | 19.2 | 20.8 |
| 5% | 1 | 19 | 21 |
| 8% | 1.6 | 18.4 | 21.6 |
| 10% | 2 | 18 | 22 |
| 14% | 2.8 | 17.2 | 22.8 |
| 15% | 3 | 17 | 23 |
| 18% | 3.6 | 16.4 | 23.6 |
| 20% | 4 | 16 | 24 |
| 25% | 5 | 15 | 25 |
| 30% | 6 | 14 | 26 |
| 50% | 10 | 10 | 30 |
9 percent of other amounts
| Amount | 9% of it |
|---|---|
| 10 | 0.9 |
| 25 | 2.25 |
| 30 | 2.7 |
| 40 | 3.6 |
| 50 | 4.5 |
| 60 | 5.4 |
| 75 | 6.75 |
| 80 | 7.2 |
| 100 | 9 |
Where this comes up
A 9% discount on a 20 price takes off 1.8, leaving 18.2. A 9% tip or tax on 20 adds 1.8, for a total of 21.8. If 20 is a score out of a possible total, 9% of it is the share 1.8 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.