Use this page when you want percent of a number worksheets in the next thirty seconds: choose how many problems you want, press print, and the answer key comes out on its own page behind the worksheet. The current sheet starts with problems like 40% of 20 and 5% of 150, and the answers (8 and 7.5) are printed on the key so marking takes about a minute.
‘New set of problems’ opens the generator in its own tab. There you can change the problem count and turn the answer key on or off. ‘Print or save as PDF’ opens the print dialog — choose Save as PDF in the printer list to keep the file. The sheet fits US Letter and A4, and the answer key prints on its own page.
This sheet uses percentages of numbers up to 200, chosen so that the arithmetic can be done mentally by a child who knows the benchmark percentages, which is why a line such as 25% of 180 turns up.
Because the numbers regenerate, the child practises the method rather than recognising familiar percentages.
The three quantities in any percentage question are the part, the whole and the rate, and every question gives two of them. Identifying which two is most of the work.
Percentages, decimals and fractions are three notations for one idea, and switching between them fluently is what makes the whole topic feel small.
Teachers usually place percent of a number worksheets alongside the ratio and proportional relationships strand for grade 6, which is where the skill sits in the majority of US state frameworks.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | 40% of 20 = | 8 | Watch for: finding the percentage of the wrong quantity |
| 2 | 5% of 150 = | 7.5 | Check: moving the decimal point the wrong way |
| 3 | 60% of 200 = | 120 | Look at: rounding money percentages badly |
| 4 | 75% of 40 = | 30 | Ask about: treating the percentage as a plain number |
| 5 | 25% of 180 = | 45 | Watch for: confusing a percentage increase with the resulting value |
| 6 | 10% of 40 = | 4 | Check: adding percentages of different wholes |
Take the first problem on the sheet as it stands, 40% of 20. Work 40% of 20 out on paper rather than in your head the first few times, say each step aloud, and check the result against 8 on the key before moving on.
The item 5% of 150 is worth doing slowly. The answer to 5% of 150 is 7.5, and the route to it is the route every other problem on this sheet takes — which is why the sheet has 20 of them rather than one.
The answer key is generated with the worksheet, not written by hand, so it always matches the sheet in front of you — 40% of 20 is listed as 8, 5% of 150 as 7.5, and so on down the page.
Because the numbers are random, there is no shared answer list to look up: the key printed behind your sheet is the only one that fits it, and it shows 8 for 40% of 20.
If the problems look cramped, drop the count from 20 to a smaller number before printing these percent of a number worksheets; the font stays the same size and the spacing opens up.
For a class set, print one sheet, press the new-worksheet button and print again. Each child gets different numbers on the same skill, so nobody can copy the answer to 40% of 20 from a neighbour.
When these become easy, move along the related links below rather than adding more problems to the same sheet.
Free printable math worksheets from a working math academy director in Korea. Problems come from our own code, not from a published workbook. Every sheet prints on US Letter or A4 with its answer key. All worksheets · Worksheet generator · Korean site
Last updated: 2026-09-13