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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 203 · 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. 1.9 + ? = 10
  2. 2.38 + ? = 100
  3. 3.8 + ? = 10
  4. 4.12 + ? = 100
  5. 5.27 + ? = 100
  6. 6.33 + ? = 100
  7. 7.26 + ? = 100
  8. 8.46 + ? = 100
  9. 9.75 + ? = 100
  10. 10.1 + ? = 10
  11. 11.85 + ? = 100
  12. 12.51 + ? = 100
  13. 13.7 + ? = 10
  14. 14.5 + ? = 10
  15. 15.19 + ? = 100
  16. 16.3 + ? = 10
  17. 17.31 + ? = 100
  18. 18.6 + ? = 10
  19. 19.48 + ? = 100
  20. 20.15 + ? = 100
  21. 21.42 + ? = 100
  22. 22.89 + ? = 100
  23. 23.20 + ? = 100
  24. 24.80 + ? = 100
  25. 25.13 + ? = 100
  26. 26.87 + ? = 100
  27. 27.65 + ? = 100
  28. 28.37 + ? = 100
  29. 29.39 + ? = 100
  30. 30.60 + ? = 100
  31. 31.25 + ? = 100
  32. 32.18 + ? = 100
  33. 33.82 + ? = 100
  34. 34.84 + ? = 100
  35. 35.45 + ? = 100
  36. 36.30 + ? = 100
  37. 37.78 + ? = 100
  38. 38.4 + ? = 10
  39. 39.36 + ? = 100
  40. 40.59 + ? = 100

Answer key

  1. 1
  2. 62
  3. 2
  4. 88
  5. 73
  6. 67
  7. 74
  8. 54
  9. 25
  10. 9
  11. 15
  12. 49
  13. 3
  14. 5
  15. 81
  16. 7
  17. 69
  18. 4
  19. 52
  20. 85
  21. 58
  22. 11
  23. 80
  24. 20
  25. 87
  26. 13
  27. 35
  28. 63
  29. 61
  30. 40
  31. 75
  32. 82
  33. 18
  34. 16
  35. 55
  36. 70
  37. 22
  38. 6
  39. 64
  40. 41

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