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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 552 · 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. 1.15 + ? = 100
  2. 2.82 + ? = 100
  3. 3.3 + ? = 10
  4. 4.6 + ? = 10
  5. 5.36 + ? = 100
  6. 6.43 + ? = 100
  7. 7.87 + ? = 100
  8. 8.2 + ? = 10
  9. 9.64 + ? = 100
  10. 10.42 + ? = 100
  11. 11.7 + ? = 10
  12. 12.63 + ? = 100
  13. 13.79 + ? = 100
  14. 14.9 + ? = 10
  15. 15.38 + ? = 100
  16. 16.31 + ? = 100
  17. 17.75 + ? = 100
  18. 18.65 + ? = 100
  19. 19.53 + ? = 100
  20. 20.1 + ? = 10
  21. 21.8 + ? = 10
  22. 22.28 + ? = 100
  23. 23.5 + ? = 10
  24. 24.55 + ? = 100
  25. 25.45 + ? = 100
  26. 26.50 + ? = 100
  27. 27.39 + ? = 100
  28. 28.16 + ? = 100
  29. 29.4 + ? = 10
  30. 30.68 + ? = 100
  31. 31.17 + ? = 100
  32. 32.11 + ? = 100
  33. 33.83 + ? = 100
  34. 34.33 + ? = 100
  35. 35.37 + ? = 100
  36. 36.57 + ? = 100
  37. 37.77 + ? = 100
  38. 38.20 + ? = 100
  39. 39.72 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 85
  2. 18
  3. 7
  4. 4
  5. 64
  6. 57
  7. 13
  8. 8
  9. 36
  10. 58
  11. 3
  12. 37
  13. 21
  14. 1
  15. 62
  16. 69
  17. 25
  18. 35
  19. 47
  20. 9
  21. 2
  22. 72
  23. 5
  24. 45
  25. 55
  26. 50
  27. 61
  28. 84
  29. 6
  30. 32
  31. 83
  32. 89
  33. 17
  34. 67
  35. 63
  36. 43
  37. 23
  38. 80
  39. 28
  40. 87

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