This page makes free printable addition within 10 worksheets on demand: press the button and you get a new sheet of 20 problems with a matching answer key, ready for US Letter or A4 paper. Right now the generator is set to problems such as 5 + 4 (answer 9) and 5 + 3 (answer 8); press the button again and the numbers change while the skill stays the same.
‘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.
Fluency in addition is usually described in two parts: knowing the single-digit facts by recall, and applying a written method to bigger numbers. This sheet exercises whichever of the two the number range implies — for 5 + 4 the answer 9 should come from memory, not from counting.
Because the addends are regenerated every time, a child cannot learn the sheet instead of the skill. Yesterday's page may have asked for 2 + 5; today's asks something else in the same shape.
What separates a confident adder from a slow one is rarely the method; it is whether the number bonds underneath are automatic. Watch how long the child hesitates before writing the first digit of 8.
Written addition is worth practising in columns — which is what these addition within 10 worksheets ask for — even when a child working at this level can do it mentally, because the column layout is what makes four-digit work manageable later. A problem such as 5 + 1 is small enough to do mentally and worth writing out anyway.
Teachers usually place addition within 10 worksheets alongside the addition strand of most US state standards for this grade, which is where the skill sits in the majority of US state frameworks.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | 5 + 4 = | 9 | Watch for: losing the place columns |
| 2 | 5 + 3 = | 8 | Check: adding right to left, then reading left to right |
| 3 | 2 + 5 = | 7 | Look at: guessing on the near-tens |
| 4 | 5 + 1 = | 6 | Ask about: forgetting the carried digit |
| 5 | 3 + 6 = | 9 | Watch for: counting on from the wrong number |
| 6 | 8 + 2 = | 10 | Check: treating a longer number as a bigger one |
A good first problem to do together is 5 + 4, which comes out at 9. Do 5 + 4 once with the child narrating, then hand over the pencil and start the clock on the other 20 problems.
Here is one worked through. 5 + 3 gives 8. If your child arrives somewhere other than 8 on 5 + 3, look at the working rather than the answer: nearly every wrong result comes from a skipped step, not an unknown fact.
Keys are produced by the same code that produces the questions, so a mismatch between question and answer is not possible on these sheets.
The answer key is generated with the worksheet, not written by hand, so it always matches the sheet in front of you — 5 + 4 is listed as 9, 5 + 3 as 8, and so on down the page.
To save these addition within 10 worksheets instead of printing them, choose 'Save as PDF' in the printer list. You get the worksheet and the answer key as a single PDF, on Letter or A4 depending on your printer settings.
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.
Keep the finished addition within 10 worksheets in date order — the drop in time across ten sheets is the clearest progress report you will get.
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