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Addition Within 20 Worksheets

Addition Within 20 worksheets help 1st Grade students practise addition within 20. A step-by-step path through first-grade addition: review sums within 10, build teen numbers as ten and some more, master the doubles, add fluently within 20, then find every pair that makes 20. Each one is free to print and comes with an answer key.

Common Core · 1.OA.6, 1.NBT.2

The addition within 20 learning path

These worksheets are a progression, not a pile — each step builds on the one before it. Start at step 1 and work down; a child who is already confident can join partway in.

  1. Addition Review: Within 10Intro
  2. Ten and Some MoreIntro
  3. Doubles to 20Practice
  4. Addition Within 20Practice
  5. Make 20Challenge
1. Addition Review: Within 10
1st Grade · Math
Intro8 versions
2. Ten and Some More
1st Grade · Math
Intro6 versions
3. Doubles to 20
1st Grade · Math
Practice4 versions
4. Addition Within 20
1st Grade · Math
Practice8 versions
5. Make 20
1st Grade · Math
Challenge6 versions

How to use these addition within 20 worksheets

Print a set for homework, morning work, or classroom practice. Because every worksheet comes in multiple sets — the same skill with different questions — you can give 1st Grade students fresh addition within 20 practice as many times as they need, then check their work with the included answer key.