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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 115 · 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. 1.7 + ? = 10
  2. 2.40 + ? = 100
  3. 3.9 + ? = 10
  4. 4.33 + ? = 100
  5. 5.1 + ? = 10
  6. 6.5 + ? = 10
  7. 7.17 + ? = 100
  8. 8.27 + ? = 100
  9. 9.41 + ? = 100
  10. 10.47 + ? = 100
  11. 11.62 + ? = 100
  12. 12.4 + ? = 10
  13. 13.53 + ? = 100
  14. 14.18 + ? = 100
  15. 15.75 + ? = 100
  16. 16.80 + ? = 100
  17. 17.84 + ? = 100
  18. 18.3 + ? = 10
  19. 19.6 + ? = 10
  20. 20.39 + ? = 100
  21. 21.60 + ? = 100
  22. 22.44 + ? = 100
  23. 23.54 + ? = 100
  24. 24.19 + ? = 100
  25. 25.12 + ? = 100
  26. 26.45 + ? = 100
  27. 27.48 + ? = 100
  28. 28.83 + ? = 100
  29. 29.22 + ? = 100
  30. 30.8 + ? = 10
  31. 31.52 + ? = 100
  32. 32.25 + ? = 100
  33. 33.81 + ? = 100
  34. 34.20 + ? = 100
  35. 35.69 + ? = 100
  36. 36.2 + ? = 10
  37. 37.31 + ? = 100
  38. 38.50 + ? = 100
  39. 39.43 + ? = 100
  40. 40.85 + ? = 100

Answer key

  1. 3
  2. 60
  3. 1
  4. 67
  5. 9
  6. 5
  7. 83
  8. 73
  9. 59
  10. 53
  11. 38
  12. 6
  13. 47
  14. 82
  15. 25
  16. 20
  17. 16
  18. 7
  19. 4
  20. 61
  21. 40
  22. 56
  23. 46
  24. 81
  25. 88
  26. 55
  27. 52
  28. 17
  29. 78
  30. 2
  31. 48
  32. 75
  33. 19
  34. 80
  35. 31
  36. 8
  37. 69
  38. 50
  39. 57
  40. 15

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