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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 687 · 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. 2.8 + ? = 10
  3. 3.33 + ? = 100
  4. 4.15 + ? = 100
  5. 5.7 + ? = 10
  6. 6.34 + ? = 100
  7. 7.17 + ? = 100
  8. 8.20 + ? = 100
  9. 9.86 + ? = 100
  10. 10.55 + ? = 100
  11. 11.23 + ? = 100
  12. 12.2 + ? = 10
  13. 13.4 + ? = 10
  14. 14.75 + ? = 100
  15. 15.14 + ? = 100
  16. 16.1 + ? = 10
  17. 17.35 + ? = 100
  18. 18.76 + ? = 100
  19. 19.16 + ? = 100
  20. 20.28 + ? = 100
  21. 21.9 + ? = 10
  22. 22.51 + ? = 100
  23. 23.5 + ? = 10
  24. 24.84 + ? = 100
  25. 25.85 + ? = 100
  26. 26.46 + ? = 100
  27. 27.26 + ? = 100
  28. 28.13 + ? = 100
  29. 29.18 + ? = 100
  30. 30.6 + ? = 10
  31. 31.31 + ? = 100
  32. 32.47 + ? = 100
  33. 33.42 + ? = 100
  34. 34.70 + ? = 100
  35. 35.30 + ? = 100
  36. 36.62 + ? = 100
  37. 37.74 + ? = 100
  38. 38.67 + ? = 100
  39. 39.89 + ? = 100
  40. 40.79 + ? = 100

Answer key

  1. 7
  2. 2
  3. 67
  4. 85
  5. 3
  6. 66
  7. 83
  8. 80
  9. 14
  10. 45
  11. 77
  12. 8
  13. 6
  14. 25
  15. 86
  16. 9
  17. 65
  18. 24
  19. 84
  20. 72
  21. 1
  22. 49
  23. 5
  24. 16
  25. 15
  26. 54
  27. 74
  28. 87
  29. 82
  30. 4
  31. 69
  32. 53
  33. 58
  34. 30
  35. 70
  36. 38
  37. 26
  38. 33
  39. 11
  40. 21

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