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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 398 · 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. 1.1 + ? = 10
  2. 2.5 + ? = 10
  3. 3.26 + ? = 100
  4. 4.2 + ? = 10
  5. 5.3 + ? = 10
  6. 6.79 + ? = 100
  7. 7.6 + ? = 10
  8. 8.73 + ? = 100
  9. 9.46 + ? = 100
  10. 10.78 + ? = 100
  11. 11.58 + ? = 100
  12. 12.20 + ? = 100
  13. 13.72 + ? = 100
  14. 14.42 + ? = 100
  15. 15.7 + ? = 10
  16. 16.21 + ? = 100
  17. 17.4 + ? = 10
  18. 18.33 + ? = 100
  19. 19.55 + ? = 100
  20. 20.8 + ? = 10
  21. 21.83 + ? = 100
  22. 22.11 + ? = 100
  23. 23.51 + ? = 100
  24. 24.13 + ? = 100
  25. 25.25 + ? = 100
  26. 26.80 + ? = 100
  27. 27.82 + ? = 100
  28. 28.38 + ? = 100
  29. 29.12 + ? = 100
  30. 30.65 + ? = 100
  31. 31.9 + ? = 10
  32. 32.68 + ? = 100
  33. 33.84 + ? = 100
  34. 34.76 + ? = 100
  35. 35.24 + ? = 100
  36. 36.18 + ? = 100
  37. 37.16 + ? = 100
  38. 38.57 + ? = 100
  39. 39.54 + ? = 100
  40. 40.36 + ? = 100

Answer key

  1. 9
  2. 5
  3. 74
  4. 8
  5. 7
  6. 21
  7. 4
  8. 27
  9. 54
  10. 22
  11. 42
  12. 80
  13. 28
  14. 58
  15. 3
  16. 79
  17. 6
  18. 67
  19. 45
  20. 2
  21. 17
  22. 89
  23. 49
  24. 87
  25. 75
  26. 20
  27. 18
  28. 62
  29. 88
  30. 35
  31. 1
  32. 32
  33. 16
  34. 24
  35. 76
  36. 82
  37. 84
  38. 43
  39. 46
  40. 64

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