Every sheet of 1st grade doubles worksheets on this page is built the moment you open it, so the 20 problems below are not the same ones the last visitor printed, and the answer key is generated with them. A typical problem from the sheet in front of you is 3 + 3, which works out to 6; another is 4 + 4, giving 8.
‘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.
Doubles are the first addition facts most children know cold, and they carry more weight than their number suggests. Once 3 + 3 gives 6 instantly, near-doubles become one step away rather than a fresh calculation.
Doubling is also halving in reverse, so this sheet quietly builds the division facts that come a year or two later.
Because the sheet regenerates, the doubles come in random order and cannot be recited as a list.
The strategy that makes them valuable is 'doubles plus one': knowing a double lets a child reach the neighbouring fact without counting.
In US classrooms these 1st grade doubles worksheets are commonly aligned with the addition fluency expectations for grade 1, though the exact wording varies from state to state.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | 3 + 3 = | 6 | Watch for: doubling only one digit in a two-digit number |
| 2 | 4 + 4 = | 8 | Check: confusing doubling with adding one |
| 3 | 2 + 2 = | 4 | Look at: counting on rather than recalling |
| 4 | 5 + 5 = | 10 | Ask about: practising in order every time |
| 5 | 1 + 1 = | 2 | Watch for: losing the larger doubles |
| 6 | 8 + 8 = | 16 | Check: treating each double as unrelated |
The item 4 + 4 is worth doing slowly. The answer to 4 + 4 is 8, 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.
Here is one worked through. 4 + 4 gives 8. If your child arrives somewhere other than 8 on 4 + 4, look at the working rather than the answer: nearly every wrong result comes from a skipped step, not an unknown fact.
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 6 for 3 + 3.
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.
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.
To save these 1st grade doubles 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.
One sheet of 1st grade doubles worksheets a day for two weeks will tell you more about where a 1st grader actually stands than any single long assessment.
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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