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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 86 · 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. 1.6 + ? = 10
  2. 2.1 + ? = 10
  3. 3.32 + ? = 100
  4. 4.21 + ? = 100
  5. 5.7 + ? = 10
  6. 6.74 + ? = 100
  7. 7.40 + ? = 100
  8. 8.66 + ? = 100
  9. 9.5 + ? = 10
  10. 10.71 + ? = 100
  11. 11.64 + ? = 100
  12. 12.20 + ? = 100
  13. 13.62 + ? = 100
  14. 14.4 + ? = 10
  15. 15.28 + ? = 100
  16. 16.34 + ? = 100
  17. 17.42 + ? = 100
  18. 18.3 + ? = 10
  19. 19.2 + ? = 10
  20. 20.86 + ? = 100
  21. 21.54 + ? = 100
  22. 22.22 + ? = 100
  23. 23.12 + ? = 100
  24. 24.35 + ? = 100
  25. 25.78 + ? = 100
  26. 26.8 + ? = 10
  27. 27.14 + ? = 100
  28. 28.61 + ? = 100
  29. 29.33 + ? = 100
  30. 30.38 + ? = 100
  31. 31.51 + ? = 100
  32. 32.9 + ? = 10
  33. 33.68 + ? = 100
  34. 34.46 + ? = 100
  35. 35.60 + ? = 100
  36. 36.31 + ? = 100
  37. 37.75 + ? = 100
  38. 38.11 + ? = 100
  39. 39.53 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 4
  2. 9
  3. 68
  4. 79
  5. 3
  6. 26
  7. 60
  8. 34
  9. 5
  10. 29
  11. 36
  12. 80
  13. 38
  14. 6
  15. 72
  16. 66
  17. 58
  18. 7
  19. 8
  20. 14
  21. 46
  22. 78
  23. 88
  24. 65
  25. 22
  26. 2
  27. 86
  28. 39
  29. 67
  30. 62
  31. 49
  32. 1
  33. 32
  34. 54
  35. 40
  36. 69
  37. 25
  38. 89
  39. 47
  40. 87

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