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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 25 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.9 + ? = 10
  2. 2.12 + ? = 100
  3. 3.8 + ? = 10
  4. 4.3 + ? = 10
  5. 5.36 + ? = 100
  6. 6.39 + ? = 100
  7. 7.47 + ? = 100
  8. 8.5 + ? = 10
  9. 9.30 + ? = 100
  10. 10.17 + ? = 100
  11. 11.1 + ? = 10
  12. 12.38 + ? = 100
  13. 13.68 + ? = 100
  14. 14.72 + ? = 100
  15. 15.60 + ? = 100
  16. 16.69 + ? = 100
  17. 17.56 + ? = 100
  18. 18.65 + ? = 100
  19. 19.76 + ? = 100
  20. 20.2 + ? = 10
  21. 21.40 + ? = 100
  22. 22.7 + ? = 10
  23. 23.20 + ? = 100
  24. 24.11 + ? = 100
  25. 25.52 + ? = 100
  26. 26.62 + ? = 100
  27. 27.4 + ? = 10
  28. 28.85 + ? = 100
  29. 29.6 + ? = 10
  30. 30.86 + ? = 100
  31. 31.88 + ? = 100
  32. 32.16 + ? = 100
  33. 33.83 + ? = 100
  34. 34.78 + ? = 100
  35. 35.42 + ? = 100
  36. 36.24 + ? = 100
  37. 37.28 + ? = 100
  38. 38.57 + ? = 100
  39. 39.23 + ? = 100
  40. 40.14 + ? = 100

Answer key

  1. 1
  2. 88
  3. 2
  4. 7
  5. 64
  6. 61
  7. 53
  8. 5
  9. 70
  10. 83
  11. 9
  12. 62
  13. 32
  14. 28
  15. 40
  16. 31
  17. 44
  18. 35
  19. 24
  20. 8
  21. 60
  22. 3
  23. 80
  24. 89
  25. 48
  26. 38
  27. 6
  28. 15
  29. 4
  30. 14
  31. 12
  32. 84
  33. 17
  34. 22
  35. 58
  36. 76
  37. 72
  38. 43
  39. 77
  40. 86

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