What is 20 Percent of 40?
20% of 40 = 8
- Result
- 8
- Remaining
- 32
- 20% as decimal
- 0.2
- 40 + 20%
- 48
Sumwise · Maintained by Theo Abbott (pen name) · automated checks · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How the checks work
How to work it out
- Turn the percentage into a decimal: 20 ÷ 100 = 0.2
- Multiply: 0.2 × 40 = 8
- Check: Work backwards: 8 ÷ 40 × 100 = 20%.
Another method. As a proportion of part to whole: 20/100 = part/40, so part = 20 × 40 ÷ 100 = 8. Both methods always give the same answer.
In a spreadsheet: =20%*40. Forgetting to divide the percentage by 100 makes the answer 100 times too big. Note that x% of y always equals y% of x.
What the result means
8 is the 20% share of 40. The remaining 80% is 32, and the two parts add back up to 40.
Discounts: 20% off an item priced $40 saves $8, so you pay $32.
Adding and taking away 20%
Increasing 40 by 20% gives 48 and decreasing it by 20% gives 32. These do not cancel out: raising 40 by 20% and then lowering the result by 20% ends at 38.4, because the second 20% is taken of a bigger number.
Related results
| 5% of 40 | 5% of 40 = 2 |
| 10% of 40 | 10% of 40 = 4 |
| 15% of 40 | 15% of 40 = 6 |
| 25% of 40 | 25% of 40 = 10 |
| 50% of 40 | 50% of 40 = 20 |
| 75% of 40 | 75% of 40 = 30 |
The other way round: 40% of 20. 20% of 40 and 40% of 20 are always equal (both are 20 × 40 ÷ 100 = 8), so you can swap the numbers when one order is easier to work out in your head.
Practice
| 4% of 28 | Show answer4% of 28 = 1.12 |
| 35% of 38 | Show answer35% of 38 = 13.3 |
| 17% of 84 | Show answer17% of 84 = 14.28 |
| 42% of 96 | Show answer42% of 96 = 40.32 |
| 19% of 23 | Show answer19% of 23 = 4.37 |
| 62% of 54 | Show answer62% of 54 = 33.48 |
How answers are calculated and checked: methodology.
Questions
What is 20 Percent of 40?
20% of 40 is 8. Formula, steps and practice examples.
What is 20% off 40?
32. Taking 20% off leaves 80% of 40.
What is 40 plus 20%?
48. Adding 20% is the same as multiplying by 1.2.