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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 185 · 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. 1.89 + ? = 100
  2. 2.5 + ? = 10
  3. 3.18 + ? = 100
  4. 4.6 + ? = 10
  5. 5.7 + ? = 10
  6. 6.9 + ? = 10
  7. 7.49 + ? = 100
  8. 8.4 + ? = 10
  9. 9.34 + ? = 100
  10. 10.2 + ? = 10
  11. 11.81 + ? = 100
  12. 12.1 + ? = 10
  13. 13.23 + ? = 100
  14. 14.14 + ? = 100
  15. 15.66 + ? = 100
  16. 16.8 + ? = 10
  17. 17.3 + ? = 10
  18. 18.25 + ? = 100
  19. 19.12 + ? = 100
  20. 20.40 + ? = 100
  21. 21.61 + ? = 100
  22. 22.76 + ? = 100
  23. 23.42 + ? = 100
  24. 24.21 + ? = 100
  25. 25.11 + ? = 100
  26. 26.46 + ? = 100
  27. 27.88 + ? = 100
  28. 28.72 + ? = 100
  29. 29.62 + ? = 100
  30. 30.64 + ? = 100
  31. 31.19 + ? = 100
  32. 32.58 + ? = 100
  33. 33.85 + ? = 100
  34. 34.84 + ? = 100
  35. 35.32 + ? = 100
  36. 36.86 + ? = 100
  37. 37.16 + ? = 100
  38. 38.69 + ? = 100
  39. 39.52 + ? = 100
  40. 40.55 + ? = 100

Answer key

  1. 11
  2. 5
  3. 82
  4. 4
  5. 3
  6. 1
  7. 51
  8. 6
  9. 66
  10. 8
  11. 19
  12. 9
  13. 77
  14. 86
  15. 34
  16. 2
  17. 7
  18. 75
  19. 88
  20. 60
  21. 39
  22. 24
  23. 58
  24. 79
  25. 89
  26. 54
  27. 12
  28. 28
  29. 38
  30. 36
  31. 81
  32. 42
  33. 15
  34. 16
  35. 68
  36. 14
  37. 84
  38. 31
  39. 48
  40. 45

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