Addition Within 20
- 14 + 13 =
- 11 + 15 =
- 8 + 13 =
- 17 + 3 =
- 6 + 16 =
- 2 + 8 =
- 5 + 0 =
- 14 + 0 =
- 2 + 13 =
- 20 + 18 =
- 11 + 0 =
- 18 + 1 =
- 15 + 7 =
- 9 + 14 =
- 7 + 2 =
- 4 + 17 =
- 4 + 1 =
- 9 + 2 =
- 13 + 5 =
- 9 + 0 =
puzzleandprint.com
Addition within 20
The standard first-year benchmark, with answer keys.
Your worksheet
Addition Within 20 — Answer Key
- 14 + 13 =27
- 11 + 15 =26
- 8 + 13 =21
- 17 + 3 =20
- 6 + 16 =22
- 2 + 8 =10
- 5 + 0 =5
- 14 + 0 =14
- 2 + 13 =15
- 20 + 18 =38
- 11 + 0 =11
- 18 + 1 =19
- 15 + 7 =22
- 9 + 14 =23
- 7 + 2 =9
- 4 + 17 =21
- 4 + 1 =5
- 9 + 2 =11
- 13 + 5 =18
- 9 + 0 =9
puzzleandprint.com
Or take one that is already made
Four sheets at different lengths. Every one is a two-page PDF — the worksheet, then the answer key on its own page.
Addition within 20 is the benchmark most curricula set for the end of the first year of formal schooling, and it is the point at which arithmetic starts becoming automatic rather than counted out. Crossing ten is the hard part — a child who is confident to ten often stalls at 8 + 5 — so a sheet that spans the whole range is more useful than one that stops at ten.
The four ready-made sheets step from a twenty-problem warm-up to a hundred-problem timed page. Fifty is the everyday size: enough to build fluency without becoming a punishment.
Short and frequent beats long and occasional here. Five minutes a day does more for recall than forty minutes once a week, because what you are building is retrieval speed rather than understanding.
If your child or class needs a narrower range — within ten, or only the pairs that cross ten — the generator takes any range you set, and the answer key always prints on its own page.
Common questions
Will subtraction give negative answers?
No. The two numbers are ordered before the problem is written, so the larger one always comes first and the answer is never below zero. The range you set is still respected.
Do division problems come out evenly?
Always. The divisor and the answer are chosen first and the dividend is calculated from them, so there is never a remainder and never a division by zero. That is built into how the problems are made rather than something filtered out afterwards.
How do I drill one times table?
Choose multiplication and set one of the two numbers to the same value at both ends — 7 to 7, for example. The other number stays a range, so you get 7 × 1 through 7 × 12 in a random order.
Where is the answer key?
On page two of the PDF, laid out in the same order as the worksheet so you can mark down the columns.
Will the same problem appear twice?
Only if your ranges cannot make enough different problems to fill the page — 1 to 3 by 1 to 3 gives nine possibilities, so a 20-problem page must repeat. The tool warns you when that happens and suggests widening a range.
Do I need an account?
No. No sign-up and no watermark, and the worksheet is generated in your browser rather than on a server.