What Is 20% of 40?
20% of 40 = 8
How to calculate 20% of 40
- Turn the percentage into a decimal by dividing by 100: 20 ÷ 100 = 0.2.
- Multiply by the number: 0.2 × 40 = 8.
X% of Y = X ÷ 100 × Y
Mental math shortcut
Find 10% by moving the decimal point one place left: 10% of 40 = 4. Double it for 20%: 8.
Swap trick: x% of y = y% of x, so 20% of 40 is the same as 40% of 20, which is also 8.
Other percentages of 40
| 5% of 40 | 2 |
| 10% of 40 | 4 |
| 15% of 40 | 6 |
| 25% of 40 | 10 |
| 30% of 40 | 12 |
| 40% of 40 | 16 |
| 50% of 40 | 20 |
| 75% of 40 | 30 |
20% of other numbers
| 20% of 10 | 2 |
| 20% of 12 | 2.4 |
| 20% of 15 | 3 |
| 20% of 20 | 4 |
| 20% of 25 | 5 |
| 20% of 30 | 6 |
| 20% of 45 | 9 |
| 20% of 50 | 10 |
| 20% of 60 | 12 |
| 20% of 70 | 14 |
| 20% of 75 | 15 |
| 20% of 80 | 16 |
| 20% of 90 | 18 |
| 20% of 100 | 20 |
| 20% of 120 | 24 |
| 20% of 125 | 25 |
| 20% of 150 | 30 |
| 20% of 180 | 36 |
| 20% of 200 | 40 |
| 20% of 250 | 50 |
| 20% of 300 | 60 |
| 20% of 400 | 80 |
Frequently asked questions
What is 20% of 40?
20% of 40 is 8 (20 ÷ 100 × 40).
What is 40 plus 20%?
40 + 20% = 48.
What is 40 minus 20%?
40 − 20% = 32.
How do you calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number: 15% of 80 = 0.15 × 80 = 12.
How do you find what percent one number is of another?
Divide the part by the whole and multiply by 100: 12 is 12 ÷ 80 × 100 = 15% of 80.