Addition within 20 worksheets
First graders add within 20 using strategies like counting on, doubles, and making a ten. These sheets stack the facts vertically so your child sees the same layout they'll use for bigger numbers later.
By grade
What students need to know
Make a ten first when you can. It turns hard facts like 9 + 6 into easy ones like 10 + 5.
This skill runs from 1st grade through 2nd grade. Pick a grade above for level-matched sentences, teaching notes, and worksheets.
Addition within 20 across the grades
1st grade
First graders add within 20 using strategies like counting on, doubles, and making a ten. These sheets stack the facts vertically so your child sees the same layout they'll use for bigger numbers later.
2nd grade
By 2nd grade the goal is memory, not counting. Students should know every sum of two one-digit numbers by heart. This sheet drills addition facts to 20 in a stacked format; add a timer for a mad-minute grid.
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