FreeMath
Grade 2easy

Number Bonds to 20 Practice

Practice number bonds to 20 for second grade. Building on bonds to 10, these facts help with mental math and subtraction strategies.

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All 20 Practice Problems

Every question in this set. Solve them on paper, or use the interactive tool above for instant feedback and hints.

  1. 1.12 + ? = 20
  2. 2.15 + ? = 20
  3. 3.17 + ? = 20
  4. 4.11 + ? = 20
  5. 5.14 + ? = 20
  6. 6.18 + ? = 20
  7. 7.13 + ? = 20
  8. 8.16 + ? = 20
  9. 9.19 + ? = 20
  10. 10.10 + ? = 20
  11. 11.20 - 12 = ?
  12. 12.20 - 15 = ?
  13. 13.20 - 17 = ?
  14. 14.20 - 11 = ?
  15. 15.20 - 14 = ?
  16. 16.20 - 18 = ?
  17. 17.20 - 13 = ?
  18. 18.20 - 16 = ?
  19. 19.20 - 19 = ?
  20. 20.20 - 10 = ?
Show answer key
  1. 1.12 + ? = 20 Answer: 8
  2. 2.15 + ? = 20 Answer: 5
  3. 3.17 + ? = 20 Answer: 3
  4. 4.11 + ? = 20 Answer: 9
  5. 5.14 + ? = 20 Answer: 6
  6. 6.18 + ? = 20 Answer: 2
  7. 7.13 + ? = 20 Answer: 7
  8. 8.16 + ? = 20 Answer: 4
  9. 9.19 + ? = 20 Answer: 1
  10. 10.10 + ? = 20 Answer: 10
  11. 11.20 - 12 = ? Answer: 8
  12. 12.20 - 15 = ? Answer: 5
  13. 13.20 - 17 = ? Answer: 3
  14. 14.20 - 11 = ? Answer: 9
  15. 15.20 - 14 = ? Answer: 6
  16. 16.20 - 18 = ? Answer: 2
  17. 17.20 - 13 = ? Answer: 7
  18. 18.20 - 16 = ? Answer: 4
  19. 19.20 - 19 = ? Answer: 1
  20. 20.20 - 10 = ? Answer: 10

About This Practice

This practice set includes 20 make-20 problems. Knowing these bonds helps students work with larger numbers mentally.

Want more practice? See all Grade 2 practice →