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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 22 · 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. 2.14 + ? = 100
  3. 3.12 + ? = 100
  4. 4.4 + ? = 10
  5. 5.9 + ? = 10
  6. 6.55 + ? = 100
  7. 7.74 + ? = 100
  8. 8.3 + ? = 10
  9. 9.5 + ? = 10
  10. 10.6 + ? = 10
  11. 11.72 + ? = 100
  12. 12.7 + ? = 10
  13. 13.1 + ? = 10
  14. 14.23 + ? = 100
  15. 15.64 + ? = 100
  16. 16.47 + ? = 100
  17. 17.39 + ? = 100
  18. 18.8 + ? = 10
  19. 19.24 + ? = 100
  20. 20.63 + ? = 100
  21. 21.42 + ? = 100
  22. 22.66 + ? = 100
  23. 23.17 + ? = 100
  24. 24.87 + ? = 100
  25. 25.18 + ? = 100
  26. 26.56 + ? = 100
  27. 27.76 + ? = 100
  28. 28.31 + ? = 100
  29. 29.29 + ? = 100
  30. 30.2 + ? = 10
  31. 31.16 + ? = 100
  32. 32.19 + ? = 100
  33. 33.40 + ? = 100
  34. 34.78 + ? = 100
  35. 35.65 + ? = 100
  36. 36.27 + ? = 100
  37. 37.13 + ? = 100
  38. 38.46 + ? = 100
  39. 39.80 + ? = 100
  40. 40.15 + ? = 100

Answer key

  1. 63
  2. 86
  3. 88
  4. 6
  5. 1
  6. 45
  7. 26
  8. 7
  9. 5
  10. 4
  11. 28
  12. 3
  13. 9
  14. 77
  15. 36
  16. 53
  17. 61
  18. 2
  19. 76
  20. 37
  21. 58
  22. 34
  23. 83
  24. 13
  25. 82
  26. 44
  27. 24
  28. 69
  29. 71
  30. 8
  31. 84
  32. 81
  33. 60
  34. 22
  35. 35
  36. 73
  37. 87
  38. 54
  39. 20
  40. 85

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