What is 21 Percent of 42?
21% of 42 = 8.82
- Result
- 8.82
- Remaining
- 33.18
- 21% as decimal
- 0.21
- 42 + 21%
- 50.82
Sumwise · Checked by Theo Abbott · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How we check it
How to work it out
- Turn the percentage into a decimal: 21 ÷ 100 = 0.21
- Multiply: 0.21 × 42 = 8.82
- Check: Work backwards: 8.82 ÷ 42 × 100 = 21%.
Another method. As a proportion of part to whole: 21/100 = part/42, so part = 21 × 42 ÷ 100 = 8.82. Both methods always give the same answer.
In a spreadsheet: =21%*42. 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
8.82 is the 21% share of 42. The remaining 79% is 33.18, and the two parts add back up to 42.
Discounts: 21% off an item priced $42 saves $8.82, so you pay $33.18.
Adding and taking away 21%
Increasing 42 by 21% gives 50.82 and decreasing it by 21% gives 33.18. These do not cancel out: raising 42 by 21% and then lowering the result by 21% ends at 40.1478, because the second 21% is taken of a bigger number.
Related results
| 5% of 42 | 5% of 42 = 2.1 |
| 10% of 42 | 10% of 42 = 4.2 |
| 15% of 42 | 15% of 42 = 6.3 |
| 20% of 42 | 20% of 42 = 8.4 |
| 25% of 42 | 25% of 42 = 10.5 |
| 50% of 42 | 50% of 42 = 21 |
| 75% of 42 | 75% of 42 = 31.5 |
The other way round: 42% of 21
Practice
| 5% of 76 | Show answer5% of 76 = 3.8 |
| 34% of 48 | Show answer34% of 48 = 16.32 |
| 68% of 77 | Show answer68% of 77 = 52.36 |
| 52% of 99 | Show answer52% of 99 = 51.48 |
| 47% of 54 | Show answer47% of 54 = 25.38 |
| 90% of 96 | Show answer90% of 96 = 86.4 |
How answers are calculated and checked: methodology.
Questions
What is 21 Percent of 42?
21% of 42 is 8.82. Formula, steps and practice examples.
What is 21% off 42?
33.18. Taking 21% off leaves 79% of 42.
What is 42 plus 21%?
50.82. Adding 21% is the same as multiplying by 1.21.