How to find 30 percent of 10
"Percent" means per hundred, so 30% is the fraction 30/100, or 0.3 as a decimal. Taking 30 percent of 10 means multiplying 10 by that fraction:
30% of 10 = 10 x 30 / 100
= 300 / 100
= 3The same answer comes from the decimal form: 10 x 0.3 = 3. And because multiplication is commutative, 30% of 10 equals 10% of 30, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 10 is 1 (move the decimal one place left), and 1% is 0.1. Build 30% from those pieces: 3 x 1 = 3.
Nearby percentages of 10
| Percent | Of 10 | 10 minus it | 10 plus it |
|---|---|---|---|
| 1% | 0.1 | 9.9 | 10.1 |
| 5% | 0.5 | 9.5 | 10.5 |
| 10% | 1 | 9 | 11 |
| 15% | 1.5 | 8.5 | 11.5 |
| 20% | 2 | 8 | 12 |
| 25% | 2.5 | 7.5 | 12.5 |
| 29% | 2.9 | 7.1 | 12.9 |
| 31% | 3.1 | 6.9 | 13.1 |
| 35% | 3.5 | 6.5 | 13.5 |
| 50% | 5 | 5 | 15 |
| 60% | 6 | 4 | 16 |
| 75% | 7.5 | 2.5 | 17.5 |
30 percent of other amounts
| Amount | 30% of it |
|---|---|
| 20 | 6 |
| 25 | 7.5 |
| 30 | 9 |
| 40 | 12 |
| 50 | 15 |
Where this comes up
A 30% discount on a 10 price takes off 3, leaving 7. A 30% tip or tax on 10 adds 3, for a total of 13. If 10 is a score out of a possible total, 30% of it is the share 3 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.