What is 45 Percent of 42?
45% of 42 = 18.9
- Result
- 18.9
- Remaining
- 23.1
- 45% as decimal
- 0.45
- 42 + 45%
- 60.9
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: 45 ÷ 100 = 0.45
- Multiply: 0.45 × 42 = 18.9
- Check: Work backwards: 18.9 ÷ 42 × 100 = 45%.
Another method. As a proportion of part to whole: 45/100 = part/42, so part = 45 × 42 ÷ 100 = 18.9. Both methods always give the same answer.
In a spreadsheet: =45%*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
18.9 is the 45% share of 42. The remaining 55% is 23.1, and the two parts add back up to 42.
Discounts: 45% off an item priced $42 saves $18.9, so you pay $23.1.
Adding and taking away 45%
Increasing 42 by 45% gives 60.9 and decreasing it by 45% gives 23.1. These do not cancel out: raising 42 by 45% and then lowering the result by 45% ends at 33.495, because the second 45% 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 45
Practice
| 9% of 35 | Show answer9% of 35 = 3.15 |
| 31% of 70 | Show answer31% of 70 = 21.7 |
| 47% of 22 | Show answer47% of 22 = 10.34 |
| 8% of 93 | Show answer8% of 93 = 7.44 |
| 74% of 19 | Show answer74% of 19 = 14.06 |
| 49% of 12 | Show answer49% of 12 = 5.88 |
How answers are calculated and checked: methodology.
Questions
What is 45 Percent of 42?
45% of 42 is 18.9. Formula, steps and practice examples.
What is 45% off 42?
23.1. Taking 45% off leaves 55% of 42.
What is 42 plus 45%?
60.9. Adding 45% is the same as multiplying by 1.45.