What is 80 Percent of 42?
80% of 42 = 33.6
- Result
- 33.6
- Remaining
- 8.4
- 80% as decimal
- 0.8
- 42 + 80%
- 75.6
Sumwise · 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: 80 ÷ 100 = 0.8
- Multiply: 0.8 × 42 = 33.6
- Check: Work backwards: 33.6 ÷ 42 × 100 = 80%.
Another method. As a proportion of part to whole: 80/100 = part/42, so part = 80 × 42 ÷ 100 = 33.6. Both methods always give the same answer.
In a spreadsheet: =80%*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
33.6 is the 80% share of 42. The remaining 20% is 8.4, and the two parts add back up to 42.
Discounts: 80% off an item priced $42 saves $33.6, so you pay $8.4.
Adding and taking away 80%
Increasing 42 by 80% gives 75.6 and decreasing it by 80% gives 8.4. These do not cancel out: raising 42 by 80% and then lowering the result by 80% ends at 15.12, because the second 80% 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 80
Practice
| 15% of 16 | Show answer15% of 16 = 2.4 |
| 42% of 17 | Show answer42% of 17 = 7.14 |
| 36% of 88 | Show answer36% of 88 = 31.68 |
| 9% of 37 | Show answer9% of 37 = 3.33 |
| 30% of 52 | Show answer30% of 52 = 15.6 |
| 92% of 26 | Show answer92% of 26 = 23.92 |
How answers are calculated and checked: methodology.
Questions
What is 80 Percent of 42?
80% of 42 is 33.6. Formula, steps and practice examples.
What is 80% off 42?
8.4. Taking 80% off leaves 20% of 42.
What is 42 plus 80%?
75.6. Adding 80% is the same as multiplying by 1.8.