How to find 5 percent of 80
"Percent" means per hundred, so 5% is the fraction 5/100, or 0.05 as a decimal. Taking 5 percent of 80 means multiplying 80 by that fraction:
5% of 80 = 80 x 5 / 100
= 400 / 100
= 4The same answer comes from the decimal form: 80 x 0.05 = 4. And because multiplication is commutative, 5% of 80 equals 80% of 5, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 80 is 8 (move the decimal one place left), and 1% is 0.8. Build 5% from those pieces: 5 x 0.8 = 4.
Nearby percentages of 80
| Percent | Of 80 | 80 minus it | 80 plus it |
|---|---|---|---|
| 1% | 0.8 | 79.2 | 80.8 |
| 4% | 3.2 | 76.8 | 83.2 |
| 6% | 4.8 | 75.2 | 84.8 |
| 10% | 8 | 72 | 88 |
| 15% | 12 | 68 | 92 |
| 20% | 16 | 64 | 96 |
| 25% | 20 | 60 | 100 |
| 30% | 24 | 56 | 104 |
| 50% | 40 | 40 | 120 |
| 75% | 60 | 20 | 140 |
5 percent of other amounts
| Amount | 5% of it |
|---|---|
| 20 | 1 |
| 25 | 1.25 |
| 30 | 1.5 |
| 40 | 2 |
| 50 | 2.5 |
| 60 | 3 |
| 75 | 3.75 |
| 100 | 5 |
| 120 | 6 |
| 150 | 7.5 |
Where this comes up
A 5% discount on a 80 price takes off 4, leaving 76. A 5% tip or tax on 80 adds 4, for a total of 84. If 80 is a score out of a possible total, 5% of it is the share 4 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.