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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 329 · 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. 1.35 + ? = 100
  2. 2.41 + ? = 100
  3. 3.1 + ? = 10
  4. 4.40 + ? = 100
  5. 5.67 + ? = 100
  6. 6.17 + ? = 100
  7. 7.68 + ? = 100
  8. 8.9 + ? = 10
  9. 9.6 + ? = 10
  10. 10.3 + ? = 10
  11. 11.8 + ? = 10
  12. 12.24 + ? = 100
  13. 13.2 + ? = 10
  14. 14.48 + ? = 100
  15. 15.14 + ? = 100
  16. 16.70 + ? = 100
  17. 17.5 + ? = 10
  18. 18.29 + ? = 100
  19. 19.18 + ? = 100
  20. 20.20 + ? = 100
  21. 21.7 + ? = 10
  22. 22.75 + ? = 100
  23. 23.38 + ? = 100
  24. 24.53 + ? = 100
  25. 25.27 + ? = 100
  26. 26.72 + ? = 100
  27. 27.65 + ? = 100
  28. 28.31 + ? = 100
  29. 29.71 + ? = 100
  30. 30.4 + ? = 10
  31. 31.51 + ? = 100
  32. 32.85 + ? = 100
  33. 33.63 + ? = 100
  34. 34.83 + ? = 100
  35. 35.22 + ? = 100
  36. 36.80 + ? = 100
  37. 37.25 + ? = 100
  38. 38.30 + ? = 100
  39. 39.32 + ? = 100
  40. 40.84 + ? = 100

Answer key

  1. 65
  2. 59
  3. 9
  4. 60
  5. 33
  6. 83
  7. 32
  8. 1
  9. 4
  10. 7
  11. 2
  12. 76
  13. 8
  14. 52
  15. 86
  16. 30
  17. 5
  18. 71
  19. 82
  20. 80
  21. 3
  22. 25
  23. 62
  24. 47
  25. 73
  26. 28
  27. 35
  28. 69
  29. 29
  30. 6
  31. 49
  32. 15
  33. 37
  34. 17
  35. 78
  36. 20
  37. 75
  38. 70
  39. 68
  40. 16

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