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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 23 · 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. 1.58 + ? = 100
  2. 2.49 + ? = 100
  3. 3.7 + ? = 10
  4. 4.84 + ? = 100
  5. 5.18 + ? = 100
  6. 6.43 + ? = 100
  7. 7.51 + ? = 100
  8. 8.4 + ? = 10
  9. 9.88 + ? = 100
  10. 10.26 + ? = 100
  11. 11.22 + ? = 100
  12. 12.56 + ? = 100
  13. 13.25 + ? = 100
  14. 14.2 + ? = 10
  15. 15.15 + ? = 100
  16. 16.71 + ? = 100
  17. 17.52 + ? = 100
  18. 18.30 + ? = 100
  19. 19.9 + ? = 10
  20. 20.1 + ? = 10
  21. 21.72 + ? = 100
  22. 22.6 + ? = 10
  23. 23.47 + ? = 100
  24. 24.46 + ? = 100
  25. 25.65 + ? = 100
  26. 26.5 + ? = 10
  27. 27.8 + ? = 10
  28. 28.17 + ? = 100
  29. 29.36 + ? = 100
  30. 30.50 + ? = 100
  31. 31.27 + ? = 100
  32. 32.83 + ? = 100
  33. 33.35 + ? = 100
  34. 34.3 + ? = 10
  35. 35.80 + ? = 100
  36. 36.74 + ? = 100
  37. 37.13 + ? = 100
  38. 38.40 + ? = 100
  39. 39.20 + ? = 100
  40. 40.24 + ? = 100

Answer key

  1. 42
  2. 51
  3. 3
  4. 16
  5. 82
  6. 57
  7. 49
  8. 6
  9. 12
  10. 74
  11. 78
  12. 44
  13. 75
  14. 8
  15. 85
  16. 29
  17. 48
  18. 70
  19. 1
  20. 9
  21. 28
  22. 4
  23. 53
  24. 54
  25. 35
  26. 5
  27. 2
  28. 83
  29. 64
  30. 50
  31. 73
  32. 17
  33. 65
  34. 7
  35. 20
  36. 26
  37. 87
  38. 60
  39. 80
  40. 76

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