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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 413 · 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. 1.1 + ? = 10
  2. 2.3 + ? = 10
  3. 3.83 + ? = 100
  4. 4.11 + ? = 100
  5. 5.9 + ? = 10
  6. 6.8 + ? = 10
  7. 7.5 + ? = 10
  8. 8.67 + ? = 100
  9. 9.6 + ? = 10
  10. 10.54 + ? = 100
  11. 11.21 + ? = 100
  12. 12.2 + ? = 10
  13. 13.28 + ? = 100
  14. 14.52 + ? = 100
  15. 15.4 + ? = 10
  16. 16.69 + ? = 100
  17. 17.71 + ? = 100
  18. 18.36 + ? = 100
  19. 19.39 + ? = 100
  20. 20.37 + ? = 100
  21. 21.23 + ? = 100
  22. 22.46 + ? = 100
  23. 23.84 + ? = 100
  24. 24.41 + ? = 100
  25. 25.7 + ? = 10
  26. 26.47 + ? = 100
  27. 27.33 + ? = 100
  28. 28.29 + ? = 100
  29. 29.59 + ? = 100
  30. 30.32 + ? = 100
  31. 31.20 + ? = 100
  32. 32.42 + ? = 100
  33. 33.51 + ? = 100
  34. 34.89 + ? = 100
  35. 35.26 + ? = 100
  36. 36.19 + ? = 100
  37. 37.16 + ? = 100
  38. 38.12 + ? = 100
  39. 39.18 + ? = 100
  40. 40.15 + ? = 100

Answer key

  1. 9
  2. 7
  3. 17
  4. 89
  5. 1
  6. 2
  7. 5
  8. 33
  9. 4
  10. 46
  11. 79
  12. 8
  13. 72
  14. 48
  15. 6
  16. 31
  17. 29
  18. 64
  19. 61
  20. 63
  21. 77
  22. 54
  23. 16
  24. 59
  25. 3
  26. 53
  27. 67
  28. 71
  29. 41
  30. 68
  31. 80
  32. 58
  33. 49
  34. 11
  35. 74
  36. 81
  37. 84
  38. 88
  39. 82
  40. 85

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