Addition Within 20

1.OA.6 — Add and subtract within 20; fluently add and subtract within 10. Strategies include making ten, decomposing to a ten, and using known equivalents

Download the ready-made PDF — the ready-made one, at its defaults. Or change anything below and build your own.

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What is on the three Addition Within 20 worksheets

Support: draws ten frames beside every problem.
On level: The grade's own level, with no drawings.
Challenge: moves the missing number out of the answer slot, and uses the harder cases.

Example problems from the on-level sheet

7 + 3 = ___
2 + 9 = ___
8 + 5 = ___

Every sheet is generated, so the numbers are different each time you make one.

Before this: K.OA.5 — fluently add and subtract within 5; 1.OA.5 — relate counting to addition and subtraction (counting on / counting back).