Subtraction Within 20 Worksheet

About this worksheet

Thirty problems that cross back over ten, the mirror of addition within 20 and just as reliably the place first graders stall. Worth giving twice: once when taught, once three weeks later.

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.