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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 71 · 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. 2.4 + ? = 10
  3. 3.76 + ? = 100
  4. 4.8 + ? = 10
  5. 5.87 + ? = 100
  6. 6.2 + ? = 10
  7. 7.3 + ? = 10
  8. 8.11 + ? = 100
  9. 9.5 + ? = 10
  10. 10.70 + ? = 100
  11. 11.72 + ? = 100
  12. 12.12 + ? = 100
  13. 13.20 + ? = 100
  14. 14.81 + ? = 100
  15. 15.35 + ? = 100
  16. 16.25 + ? = 100
  17. 17.26 + ? = 100
  18. 18.79 + ? = 100
  19. 19.9 + ? = 10
  20. 20.6 + ? = 10
  21. 21.48 + ? = 100
  22. 22.29 + ? = 100
  23. 23.80 + ? = 100
  24. 24.15 + ? = 100
  25. 25.74 + ? = 100
  26. 26.66 + ? = 100
  27. 27.71 + ? = 100
  28. 28.1 + ? = 10
  29. 29.55 + ? = 100
  30. 30.47 + ? = 100
  31. 31.57 + ? = 100
  32. 32.65 + ? = 100
  33. 33.33 + ? = 100
  34. 34.60 + ? = 100
  35. 35.78 + ? = 100
  36. 36.75 + ? = 100
  37. 37.83 + ? = 100
  38. 38.89 + ? = 100
  39. 39.42 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 42
  2. 6
  3. 24
  4. 2
  5. 13
  6. 8
  7. 7
  8. 89
  9. 5
  10. 30
  11. 28
  12. 88
  13. 80
  14. 19
  15. 65
  16. 75
  17. 74
  18. 21
  19. 1
  20. 4
  21. 52
  22. 71
  23. 20
  24. 85
  25. 26
  26. 34
  27. 29
  28. 9
  29. 45
  30. 53
  31. 43
  32. 35
  33. 67
  34. 40
  35. 22
  36. 25
  37. 17
  38. 11
  39. 58
  40. 48

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