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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 17 · 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. 1.58 + ? = 100
  2. 2.1 + ? = 10
  3. 3.59 + ? = 100
  4. 4.8 + ? = 10
  5. 5.88 + ? = 100
  6. 6.89 + ? = 100
  7. 7.45 + ? = 100
  8. 8.3 + ? = 10
  9. 9.85 + ? = 100
  10. 10.7 + ? = 10
  11. 11.6 + ? = 10
  12. 12.67 + ? = 100
  13. 13.56 + ? = 100
  14. 14.50 + ? = 100
  15. 15.16 + ? = 100
  16. 16.14 + ? = 100
  17. 17.4 + ? = 10
  18. 18.12 + ? = 100
  19. 19.71 + ? = 100
  20. 20.52 + ? = 100
  21. 21.5 + ? = 10
  22. 22.13 + ? = 100
  23. 23.19 + ? = 100
  24. 24.72 + ? = 100
  25. 25.28 + ? = 100
  26. 26.53 + ? = 100
  27. 27.32 + ? = 100
  28. 28.9 + ? = 10
  29. 29.29 + ? = 100
  30. 30.2 + ? = 10
  31. 31.87 + ? = 100
  32. 32.18 + ? = 100
  33. 33.17 + ? = 100
  34. 34.43 + ? = 100
  35. 35.24 + ? = 100
  36. 36.82 + ? = 100
  37. 37.44 + ? = 100
  38. 38.80 + ? = 100
  39. 39.68 + ? = 100
  40. 40.83 + ? = 100

Answer key

  1. 42
  2. 9
  3. 41
  4. 2
  5. 12
  6. 11
  7. 55
  8. 7
  9. 15
  10. 3
  11. 4
  12. 33
  13. 44
  14. 50
  15. 84
  16. 86
  17. 6
  18. 88
  19. 29
  20. 48
  21. 5
  22. 87
  23. 81
  24. 28
  25. 72
  26. 47
  27. 68
  28. 1
  29. 71
  30. 8
  31. 13
  32. 82
  33. 83
  34. 57
  35. 76
  36. 18
  37. 56
  38. 20
  39. 32
  40. 17

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