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Addition Within 20

Name: ______________Date: ________Score: ____
1)
12
+ 8
2)
12
+ 3
3)
12
+ 6
4)
12
+ 1
5)
12
+ 4
6)
12
+ 7
7)
12
+ 2
8)
12
+ 5
9)
12
+ 8
10)
12
+ 3
11)
12
+ 6
12)
12
+ 1
13)
12
+ 4
14)
12
+ 7
15)
12
+ 2

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1st & 2nd Grade

Addition Within 20

Build fact fluency with sums to 20, the foundation for mental math.

Grade
1st & 2nd Grade
Common Core
1.OA.C.6
Topic
Addition Worksheets
Format
PDF · A4 / Letter
Customize this worksheet →See all in this topic →

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Sample problems

  1. 1.12 + 8
  2. 2.12 + 3
  3. 3.12 + 6
  4. 4.12 + 1
  5. 5.12 + 4
  6. 6.12 + 7
  7. 7.12 + 2
  8. 8.12 + 5
  9. 9.12 + 8
  10. 10.12 + 3
  11. 11.12 + 6
  12. 12.12 + 1
  13. 13.12 + 4
  14. 14.12 + 7
  15. 15.12 + 2
Answer key
  1. 1.20
  2. 2.15
  3. 3.18
  4. 4.13
  5. 5.16
  6. 6.19
  7. 7.14
  8. 8.17
  9. 9.20
  10. 10.15
  11. 11.18
  12. 12.13
  13. 13.16
  14. 14.19
  15. 15.14

About this Addition Within 20 worksheet

This addition within 20 worksheet is aimed at 1st & 2nd Grade students and is generated by MathPrepAI's algorithmic engine — so you can produce unlimited fresh versions with automatic answer keys. Adjust the number of problems, difficulty, and page layout, then download a print-ready PDF. It aligns with Common Core standard 1.OA.C.6.

Browse more by grade: Grade 1, Grade 2.

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