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Addition Within 20

Name: ______________Date: _______
1)
12
+ 8
2)
12
+ 3
3)
12
+ 6
4)
12
+ 1
5)
12
+ 4
6)
12
+ 7

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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
Make & download PDFSee all in this topic →

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
Answer key
  1. 1.20
  2. 2.15
  3. 3.18
  4. 4.13
  5. 5.16
  6. 6.19

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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