1st Grade Addition Worksheets (Within 20)
Free printable first-grade addition worksheets with a built-in answer key, adjustable number range, and optional ten-frame visuals. Generate a fresh PDF every time — no signup, no limits.
Aligned to CCSS 1.OA.6 · Add & subtract within 20
Practices CCSS 1.OA.8
Addition Within 20
Aligned to CCSS 1.OA.6
Name: ___________________________ Date: _____________
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FAQ
What does “addition within 20” mean?
Addition within 20 means both the numbers being added and their total stay at 20 or below — for example 8 + 6 = 14. This is the core first-grade addition standard (CCSS 1.OA.6), where students work toward fluency with facts to 10 and strategies for facts to 20.
What is a ten-frame and why use it?
A ten-frame is a 2×5 grid that holds up to ten counters. It helps first graders “see” numbers, spot how far a number is from 10, and use the make-a-ten strategy (8 + 6 = 8 + 2 + 4). The ten-frame layout on this generator adds that visual support to every problem.
Are these worksheets really free?
Yes — every worksheet on Printable Polly is 100% free with no signup, no account, and no download limit. Set your options, click Download PDF, and print as many fresh worksheets as you want.
How many addition problems should a first grader do at once?
For ages 6–7, short and frequent beats long and rare. A page of 12–20 problems a few times a week builds fluency without fatigue. Use the “Generate New” button for a fresh set every session so kids practice the skill, not a memorized sheet.