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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 475 · 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. 1.39 + ? = 100
  2. 2.71 + ? = 100
  3. 3.72 + ? = 100
  4. 4.50 + ? = 100
  5. 5.45 + ? = 100
  6. 6.57 + ? = 100
  7. 7.11 + ? = 100
  8. 8.3 + ? = 10
  9. 9.26 + ? = 100
  10. 10.1 + ? = 10
  11. 11.84 + ? = 100
  12. 12.70 + ? = 100
  13. 13.58 + ? = 100
  14. 14.13 + ? = 100
  15. 15.5 + ? = 10
  16. 16.66 + ? = 100
  17. 17.40 + ? = 100
  18. 18.8 + ? = 10
  19. 19.9 + ? = 10
  20. 20.86 + ? = 100
  21. 21.41 + ? = 100
  22. 22.4 + ? = 10
  23. 23.18 + ? = 100
  24. 24.80 + ? = 100
  25. 25.25 + ? = 100
  26. 26.31 + ? = 100
  27. 27.15 + ? = 100
  28. 28.28 + ? = 100
  29. 29.14 + ? = 100
  30. 30.78 + ? = 100
  31. 31.82 + ? = 100
  32. 32.7 + ? = 10
  33. 33.46 + ? = 100
  34. 34.20 + ? = 100
  35. 35.56 + ? = 100
  36. 36.49 + ? = 100
  37. 37.38 + ? = 100
  38. 38.22 + ? = 100
  39. 39.24 + ? = 100
  40. 40.21 + ? = 100

Answer key

  1. 61
  2. 29
  3. 28
  4. 50
  5. 55
  6. 43
  7. 89
  8. 7
  9. 74
  10. 9
  11. 16
  12. 30
  13. 42
  14. 87
  15. 5
  16. 34
  17. 60
  18. 2
  19. 1
  20. 14
  21. 59
  22. 6
  23. 82
  24. 20
  25. 75
  26. 69
  27. 85
  28. 72
  29. 86
  30. 22
  31. 18
  32. 3
  33. 54
  34. 80
  35. 44
  36. 51
  37. 62
  38. 78
  39. 76
  40. 79

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