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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 501 · 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. 1.84 + ? = 100
  2. 2.75 + ? = 100
  3. 3.69 + ? = 100
  4. 4.8 + ? = 10
  5. 5.3 + ? = 10
  6. 6.19 + ? = 100
  7. 7.2 + ? = 10
  8. 8.1 + ? = 10
  9. 9.56 + ? = 100
  10. 10.4 + ? = 10
  11. 11.79 + ? = 100
  12. 12.7 + ? = 10
  13. 13.47 + ? = 100
  14. 14.80 + ? = 100
  15. 15.6 + ? = 10
  16. 16.16 + ? = 100
  17. 17.36 + ? = 100
  18. 18.13 + ? = 100
  19. 19.73 + ? = 100
  20. 20.88 + ? = 100
  21. 21.62 + ? = 100
  22. 22.5 + ? = 10
  23. 23.85 + ? = 100
  24. 24.82 + ? = 100
  25. 25.45 + ? = 100
  26. 26.20 + ? = 100
  27. 27.39 + ? = 100
  28. 28.37 + ? = 100
  29. 29.12 + ? = 100
  30. 30.71 + ? = 100
  31. 31.50 + ? = 100
  32. 32.51 + ? = 100
  33. 33.21 + ? = 100
  34. 34.18 + ? = 100
  35. 35.11 + ? = 100
  36. 36.25 + ? = 100
  37. 37.26 + ? = 100
  38. 38.64 + ? = 100
  39. 39.57 + ? = 100
  40. 40.24 + ? = 100

Answer key

  1. 16
  2. 25
  3. 31
  4. 2
  5. 7
  6. 81
  7. 8
  8. 9
  9. 44
  10. 6
  11. 21
  12. 3
  13. 53
  14. 20
  15. 4
  16. 84
  17. 64
  18. 87
  19. 27
  20. 12
  21. 38
  22. 5
  23. 15
  24. 18
  25. 55
  26. 80
  27. 61
  28. 63
  29. 88
  30. 29
  31. 50
  32. 49
  33. 79
  34. 82
  35. 89
  36. 75
  37. 74
  38. 36
  39. 43
  40. 76

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