Addition Within 20

Grade 1 Math Worksheet - Challenge Me

NameDate

Write the answer on the line.

  1. 10 + 9 =

  2. 10 + 5 =

  3. 7 + 10 =

  4. 8 + 10 =

  5. 7 + 8 =

  6. 10 + 10 = ____

  7. 9 + 8 =

  8. 6 + 10 =

  9. 9 + 7 =

  10. 10 + 8 =

  11. 9 + 6 =

  12. 10 + 6 =

  13. 7 + 9 =

  14. 10 + 7 =

  15. 5 + 10 =

  16. 6 + 9 =

  17. 8 + 8 =

  18. 9 + 9 =

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Addition Within 20

Answer Key - Grade 1 Math Worksheet - Challenge Me

Write the answer on the line.

  1. 10 + 9 = 19

  2. 10 + 5 = 15

  3. 7 + 10 = 17

  4. 8 + 10 = 18

  5. 7 + 8 = 15

  6. 10 + 10 = ____

    20
  7. 9 + 8 = 17

  8. 6 + 10 = 16

  9. 9 + 7 = 16

  10. 10 + 8 = 18

  11. 9 + 6 = 15

  12. 10 + 6 = 16

  13. 7 + 9 = 16

  14. 10 + 7 = 17

  15. 5 + 10 = 15

  16. 6 + 9 = 15

  17. 8 + 8 = 16

  18. 9 + 9 = 18