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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 18 · 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. 1.57 + ? = 100
  2. 2.9 + ? = 10
  3. 3.13 + ? = 100
  4. 4.88 + ? = 100
  5. 5.46 + ? = 100
  6. 6.17 + ? = 100
  7. 7.31 + ? = 100
  8. 8.19 + ? = 100
  9. 9.75 + ? = 100
  10. 10.22 + ? = 100
  11. 11.2 + ? = 10
  12. 12.6 + ? = 10
  13. 13.21 + ? = 100
  14. 14.87 + ? = 100
  15. 15.43 + ? = 100
  16. 16.4 + ? = 10
  17. 17.59 + ? = 100
  18. 18.66 + ? = 100
  19. 19.1 + ? = 10
  20. 20.51 + ? = 100
  21. 21.8 + ? = 10
  22. 22.5 + ? = 10
  23. 23.82 + ? = 100
  24. 24.62 + ? = 100
  25. 25.45 + ? = 100
  26. 26.12 + ? = 100
  27. 27.70 + ? = 100
  28. 28.85 + ? = 100
  29. 29.11 + ? = 100
  30. 30.74 + ? = 100
  31. 31.84 + ? = 100
  32. 32.16 + ? = 100
  33. 33.53 + ? = 100
  34. 34.7 + ? = 10
  35. 35.28 + ? = 100
  36. 36.72 + ? = 100
  37. 37.61 + ? = 100
  38. 38.40 + ? = 100
  39. 39.3 + ? = 10
  40. 40.86 + ? = 100

Answer key

  1. 43
  2. 1
  3. 87
  4. 12
  5. 54
  6. 83
  7. 69
  8. 81
  9. 25
  10. 78
  11. 8
  12. 4
  13. 79
  14. 13
  15. 57
  16. 6
  17. 41
  18. 34
  19. 9
  20. 49
  21. 2
  22. 5
  23. 18
  24. 38
  25. 55
  26. 88
  27. 30
  28. 15
  29. 89
  30. 26
  31. 16
  32. 84
  33. 47
  34. 3
  35. 72
  36. 28
  37. 39
  38. 60
  39. 7
  40. 14

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