Sumwise

What is 31 Percent of 42?

31% of 42 = 13.02

Result
13.02
Remaining
28.98
31% as decimal
0.31
42 + 31%
55.02

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

  1. Turn the percentage into a decimal: 31 ÷ 100 = 0.31
  2. Multiply: 0.31 × 42 = 13.02
  3. Check: Work backwards: 13.02 ÷ 42 × 100 = 31%.

Another method. As a proportion of part to whole: 31/100 = part/42, so part = 31 × 42 ÷ 100 = 13.02. Both methods always give the same answer.

In a spreadsheet: =31%*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

13.02 is the 31% share of 42. The remaining 69% is 28.98, and the two parts add back up to 42.

Discounts: 31% off an item priced $42 saves $13.02, so you pay $28.98.

Adding and taking away 31%

Increasing 42 by 31% gives 55.02 and decreasing it by 31% gives 28.98. These do not cancel out: raising 42 by 31% and then lowering the result by 31% ends at 37.9638, because the second 31% is taken of a bigger number.

Related results

Results for nearby numbers
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 31. 31% of 42 and 42% of 31 are always equal (both are 31 × 42 ÷ 100 = 13.02), so you can swap the numbers when one order is easier to work out in your head.

Practice

7% of 70
Show answer

7% of 70 = 4.9

63% of 6
Show answer

63% of 6 = 3.78

14% of 23
Show answer

14% of 23 = 3.22

47% of 39
Show answer

47% of 39 = 18.33

14% of 28
Show answer

14% of 28 = 3.92

37% of 93
Show answer

37% of 93 = 34.41

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 31 Percent of 42?

31% of 42 is 13.02. Formula, steps and practice examples.

What is 31% off 42?

28.98. Taking 31% off leaves 69% of 42.

What is 42 plus 31%?

55.02. Adding 31% is the same as multiplying by 1.31.