Addition Within 20 Worksheet

About this worksheet

Thirty problems crossing the ten boundary, which is exactly where first graders slow down. Give it after the make-ten strategy has been taught rather than before — the point is to practise the strategy, not to discover it under time pressure.

How to use it

• Print it as it is. Page one is the worksheet, page two is the answer key.
• Need a second version? Press Get a different sheet for a fresh set of problems on the same skill — useful for retests, or so neighbours do not have identical pages.
• Every answer is a whole number. No negatives, no remainders, nothing that needs a calculator.