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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 718 · 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. 1.8 + ? = 10
  2. 2.7 + ? = 10
  3. 3.88 + ? = 100
  4. 4.5 + ? = 10
  5. 5.1 + ? = 10
  6. 6.38 + ? = 100
  7. 7.43 + ? = 100
  8. 8.32 + ? = 100
  9. 9.46 + ? = 100
  10. 10.50 + ? = 100
  11. 11.45 + ? = 100
  12. 12.6 + ? = 10
  13. 13.29 + ? = 100
  14. 14.26 + ? = 100
  15. 15.9 + ? = 10
  16. 16.22 + ? = 100
  17. 17.89 + ? = 100
  18. 18.21 + ? = 100
  19. 19.57 + ? = 100
  20. 20.35 + ? = 100
  21. 21.42 + ? = 100
  22. 22.44 + ? = 100
  23. 23.4 + ? = 10
  24. 24.63 + ? = 100
  25. 25.3 + ? = 10
  26. 26.2 + ? = 10
  27. 27.70 + ? = 100
  28. 28.27 + ? = 100
  29. 29.84 + ? = 100
  30. 30.58 + ? = 100
  31. 31.64 + ? = 100
  32. 32.82 + ? = 100
  33. 33.19 + ? = 100
  34. 34.12 + ? = 100
  35. 35.79 + ? = 100
  36. 36.54 + ? = 100
  37. 37.14 + ? = 100
  38. 38.36 + ? = 100
  39. 39.61 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 2
  2. 3
  3. 12
  4. 5
  5. 9
  6. 62
  7. 57
  8. 68
  9. 54
  10. 50
  11. 55
  12. 4
  13. 71
  14. 74
  15. 1
  16. 78
  17. 11
  18. 79
  19. 43
  20. 65
  21. 58
  22. 56
  23. 6
  24. 37
  25. 7
  26. 8
  27. 30
  28. 73
  29. 16
  30. 42
  31. 36
  32. 18
  33. 81
  34. 88
  35. 21
  36. 46
  37. 86
  38. 64
  39. 39
  40. 22

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