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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 3 · 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. 1.37 + ? = 100
  2. 2.70 + ? = 100
  3. 3.86 + ? = 100
  4. 4.88 + ? = 100
  5. 5.3 + ? = 10
  6. 6.1 + ? = 10
  7. 7.2 + ? = 10
  8. 8.8 + ? = 10
  9. 9.38 + ? = 100
  10. 10.26 + ? = 100
  11. 11.48 + ? = 100
  12. 12.19 + ? = 100
  13. 13.28 + ? = 100
  14. 14.84 + ? = 100
  15. 15.53 + ? = 100
  16. 16.65 + ? = 100
  17. 17.6 + ? = 10
  18. 18.66 + ? = 100
  19. 19.44 + ? = 100
  20. 20.24 + ? = 100
  21. 21.14 + ? = 100
  22. 22.7 + ? = 10
  23. 23.18 + ? = 100
  24. 24.55 + ? = 100
  25. 25.41 + ? = 100
  26. 26.21 + ? = 100
  27. 27.9 + ? = 10
  28. 28.5 + ? = 10
  29. 29.78 + ? = 100
  30. 30.32 + ? = 100
  31. 31.73 + ? = 100
  32. 32.4 + ? = 10
  33. 33.46 + ? = 100
  34. 34.83 + ? = 100
  35. 35.76 + ? = 100
  36. 36.68 + ? = 100
  37. 37.15 + ? = 100
  38. 38.36 + ? = 100
  39. 39.13 + ? = 100
  40. 40.17 + ? = 100

Answer key

  1. 63
  2. 30
  3. 14
  4. 12
  5. 7
  6. 9
  7. 8
  8. 2
  9. 62
  10. 74
  11. 52
  12. 81
  13. 72
  14. 16
  15. 47
  16. 35
  17. 4
  18. 34
  19. 56
  20. 76
  21. 86
  22. 3
  23. 82
  24. 45
  25. 59
  26. 79
  27. 1
  28. 5
  29. 22
  30. 68
  31. 27
  32. 6
  33. 54
  34. 17
  35. 24
  36. 32
  37. 85
  38. 64
  39. 87
  40. 83

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