The worksheet generator on this page produces time conversion worksheets with real, freshly randomised numbers — 20 of them per sheet by default — plus the answer key a parent or teacher needs to mark it quickly. Two of the problems on the sheet as it stands are 12 minutes = □ seconds and 3 weeks = □ days — answers 720 and 21 — and a new set is one click away.
‘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.
Customary conversions have to be learned as facts, twelve inches to a foot and three feet to a yard, because a problem like 3 weeks = □ days offers no pattern to fall back on.
Because each sheet is new, the child cannot rely on remembering a particular converted value.
Metric conversions are all powers of ten, which makes them a decimal place-value exercise as much as a measurement one.
Converting between units is multiplication or division by a conversion factor, and the only real decision is which way round. A conversion such as 12 minutes = □ seconds gives 720 because the new unit is smaller, so there must be more of them.
Teachers usually place time conversion worksheets alongside the measurement and data strand for this grade, which is where the skill sits in the majority of US state frameworks.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | 12 minutes = □ seconds | 720 | Watch for: losing a factor of ten in metric work |
| 2 | 3 weeks = □ days | 21 | Check: using the wrong conversion factor |
| 3 | 2 weeks = □ days | 14 | Look at: multiplying when division was needed |
| 4 | 10 minutes = □ seconds | 600 | Ask about: assuming metric and customary units interchange neatly |
| 5 | 5 weeks = □ days | 35 | Watch for: dropping the unit from the answer |
| 6 | 11 minutes = □ seconds | 660 | Check: converting in two steps and rounding in the middle |
Here is one worked through. 3 weeks = □ days gives 21. If your child arrives somewhere other than 21 on 3 weeks = □ days, look at the working rather than the answer: nearly every wrong result comes from a skipped step, not an unknown fact.
A good first problem to do together is 12 minutes = □ seconds, which comes out at 720. Do 12 minutes = □ seconds once with the child narrating, then hand over the pencil and start the clock on the other 20 problems.
Every generated sheet carries its own key on a separate printed page, which lets a child self-mark without seeing the answers while they work.
The answer key is generated with the worksheet, not written by hand, so it always matches the sheet in front of you — 12 minutes = □ seconds is listed as 720, 3 weeks = □ days as 21, and so on down the page.
The sheet is laid out to fit one page on both US Letter and A4. Leave the browser scaling at 100% and turn headers and footers off, and the 20 problems land inside the margins on either paper size.
Printing works the same on US Letter and A4, because the layout uses relative widths rather than fixed inches. Set margins to default and scaling to 100%, and all 20 problems fit.
Print a sheet of time conversion worksheets, run it for 10 minutes, mark it together, and come back tomorrow for a different set of numbers on the same skill.
→ Free Measurement Conversion Worksheets
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