How to find 10 percent of 30
"Percent" means per hundred, so 10% is the fraction 10/100, or 0.1 as a decimal. Taking 10 percent of 30 means multiplying 30 by that fraction:
10% of 30 = 30 x 10 / 100
= 300 / 100
= 3The same answer comes from the decimal form: 30 x 0.1 = 3. And because multiplication is commutative, 10% of 30 equals 30% of 10, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 30 is 3 (move the decimal one place left), and 1% is 0.3. Build 10% from those pieces: 1 x 3 = 3.
Nearby percentages of 30
| Percent | Of 30 | 30 minus it | 30 plus it |
|---|---|---|---|
| 1% | 0.3 | 29.7 | 30.3 |
| 5% | 1.5 | 28.5 | 31.5 |
| 9% | 2.7 | 27.3 | 32.7 |
| 11% | 3.3 | 26.7 | 33.3 |
| 15% | 4.5 | 25.5 | 34.5 |
| 20% | 6 | 24 | 36 |
| 25% | 7.5 | 22.5 | 37.5 |
| 30% | 9 | 21 | 39 |
| 50% | 15 | 15 | 45 |
| 75% | 22.5 | 7.5 | 52.5 |
10 percent of other amounts
| Amount | 10% of it |
|---|---|
| 10 | 1 |
| 20 | 2 |
| 25 | 2.5 |
| 40 | 4 |
| 50 | 5 |
| 60 | 6 |
| 75 | 7.5 |
| 80 | 8 |
| 100 | 10 |
| 120 | 12 |
Where this comes up
A 10% discount on a 30 price takes off 3, leaving 27. A 10% tip or tax on 30 adds 3, for a total of 33. If 30 is a score out of a possible total, 10% of it is the share 3 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.