Subtraction within 20 Worksheet for 1st Grade

What is on the sheet

20 subtraction problems for 1st grade, each one inside its own little picture frame. About half of the problems need regrouping, so students practice deciding when to borrow. Kids who finish early can color the frames, and the full answer key is printed on page 2.

How to get the most out of it

• Always subtract the ones first.
• When the top digit is smaller, borrow one from the next place and add ten to the current column.
• Check each answer by adding it to the bottom number; you should get the top number.

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