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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 165 · 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. 1.22 + ? = 100
  2. 2.45 + ? = 100
  3. 3.48 + ? = 100
  4. 4.75 + ? = 100
  5. 5.26 + ? = 100
  6. 6.84 + ? = 100
  7. 7.30 + ? = 100
  8. 8.1 + ? = 10
  9. 9.3 + ? = 10
  10. 10.9 + ? = 10
  11. 11.58 + ? = 100
  12. 12.36 + ? = 100
  13. 13.2 + ? = 10
  14. 14.66 + ? = 100
  15. 15.12 + ? = 100
  16. 16.7 + ? = 10
  17. 17.70 + ? = 100
  18. 18.5 + ? = 10
  19. 19.8 + ? = 10
  20. 20.63 + ? = 100
  21. 21.72 + ? = 100
  22. 22.52 + ? = 100
  23. 23.47 + ? = 100
  24. 24.54 + ? = 100
  25. 25.33 + ? = 100
  26. 26.39 + ? = 100
  27. 27.4 + ? = 10
  28. 28.37 + ? = 100
  29. 29.46 + ? = 100
  30. 30.81 + ? = 100
  31. 31.50 + ? = 100
  32. 32.64 + ? = 100
  33. 33.76 + ? = 100
  34. 34.6 + ? = 10
  35. 35.19 + ? = 100
  36. 36.71 + ? = 100
  37. 37.86 + ? = 100
  38. 38.13 + ? = 100
  39. 39.82 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 78
  2. 55
  3. 52
  4. 25
  5. 74
  6. 16
  7. 70
  8. 9
  9. 7
  10. 1
  11. 42
  12. 64
  13. 8
  14. 34
  15. 88
  16. 3
  17. 30
  18. 5
  19. 2
  20. 37
  21. 28
  22. 48
  23. 53
  24. 46
  25. 67
  26. 61
  27. 6
  28. 63
  29. 54
  30. 19
  31. 50
  32. 36
  33. 24
  34. 4
  35. 81
  36. 29
  37. 14
  38. 87
  39. 18
  40. 66

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