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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 447 · 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. 1.3 + ? = 10
  2. 2.4 + ? = 10
  3. 3.83 + ? = 100
  4. 4.40 + ? = 100
  5. 5.27 + ? = 100
  6. 6.2 + ? = 10
  7. 7.7 + ? = 10
  8. 8.34 + ? = 100
  9. 9.30 + ? = 100
  10. 10.22 + ? = 100
  11. 11.1 + ? = 10
  12. 12.59 + ? = 100
  13. 13.61 + ? = 100
  14. 14.42 + ? = 100
  15. 15.9 + ? = 10
  16. 16.8 + ? = 10
  17. 17.14 + ? = 100
  18. 18.50 + ? = 100
  19. 19.84 + ? = 100
  20. 20.23 + ? = 100
  21. 21.6 + ? = 10
  22. 22.25 + ? = 100
  23. 23.77 + ? = 100
  24. 24.75 + ? = 100
  25. 25.71 + ? = 100
  26. 26.21 + ? = 100
  27. 27.60 + ? = 100
  28. 28.5 + ? = 10
  29. 29.58 + ? = 100
  30. 30.29 + ? = 100
  31. 31.48 + ? = 100
  32. 32.78 + ? = 100
  33. 33.85 + ? = 100
  34. 34.20 + ? = 100
  35. 35.62 + ? = 100
  36. 36.11 + ? = 100
  37. 37.35 + ? = 100
  38. 38.28 + ? = 100
  39. 39.65 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 7
  2. 6
  3. 17
  4. 60
  5. 73
  6. 8
  7. 3
  8. 66
  9. 70
  10. 78
  11. 9
  12. 41
  13. 39
  14. 58
  15. 1
  16. 2
  17. 86
  18. 50
  19. 16
  20. 77
  21. 4
  22. 75
  23. 23
  24. 25
  25. 29
  26. 79
  27. 40
  28. 5
  29. 42
  30. 71
  31. 52
  32. 22
  33. 15
  34. 80
  35. 38
  36. 89
  37. 65
  38. 72
  39. 35
  40. 87

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