Subtraction within 20 worksheets
First graders subtract within 20 using strategies like counting back, counting up, and thinking of the matching addition fact. The stacked layout mirrors the addition sheets, so the two skills feel like one family.
By grade
What students need to know
Think addition to subtract: for 13 − 8, ask what you add to 8 to make 13.
This skill runs from 1st grade through 2nd grade. Pick a grade above for level-matched sentences, teaching notes, and worksheets.
Subtraction within 20 across the grades
1st grade
First graders subtract within 20 using strategies like counting back, counting up, and thinking of the matching addition fact. The stacked layout mirrors the addition sheets, so the two skills feel like one family.
2nd grade
Second graders are expected to subtract within 20 from memory by the end of the year. This sheet drills those facts in a vertical stack, and it works as a timed mad-minute grid too.
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