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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 681 · 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. 1.4 + ? = 10
  2. 2.34 + ? = 100
  3. 3.12 + ? = 100
  4. 4.31 + ? = 100
  5. 5.1 + ? = 10
  6. 6.7 + ? = 10
  7. 7.2 + ? = 10
  8. 8.72 + ? = 100
  9. 9.35 + ? = 100
  10. 10.83 + ? = 100
  11. 11.74 + ? = 100
  12. 12.15 + ? = 100
  13. 13.21 + ? = 100
  14. 14.20 + ? = 100
  15. 15.60 + ? = 100
  16. 16.89 + ? = 100
  17. 17.40 + ? = 100
  18. 18.8 + ? = 10
  19. 19.69 + ? = 100
  20. 20.18 + ? = 100
  21. 21.3 + ? = 10
  22. 22.37 + ? = 100
  23. 23.9 + ? = 10
  24. 24.5 + ? = 10
  25. 25.14 + ? = 100
  26. 26.80 + ? = 100
  27. 27.27 + ? = 100
  28. 28.84 + ? = 100
  29. 29.59 + ? = 100
  30. 30.6 + ? = 10
  31. 31.77 + ? = 100
  32. 32.54 + ? = 100
  33. 33.24 + ? = 100
  34. 34.36 + ? = 100
  35. 35.64 + ? = 100
  36. 36.81 + ? = 100
  37. 37.50 + ? = 100
  38. 38.73 + ? = 100
  39. 39.43 + ? = 100
  40. 40.17 + ? = 100

Answer key

  1. 6
  2. 66
  3. 88
  4. 69
  5. 9
  6. 3
  7. 8
  8. 28
  9. 65
  10. 17
  11. 26
  12. 85
  13. 79
  14. 80
  15. 40
  16. 11
  17. 60
  18. 2
  19. 31
  20. 82
  21. 7
  22. 63
  23. 1
  24. 5
  25. 86
  26. 20
  27. 73
  28. 16
  29. 41
  30. 4
  31. 23
  32. 46
  33. 76
  34. 64
  35. 36
  36. 19
  37. 50
  38. 27
  39. 57
  40. 83

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