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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 992 · 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. 1.49 + ? = 100
  2. 2.81 + ? = 100
  3. 3.65 + ? = 100
  4. 4.44 + ? = 100
  5. 5.43 + ? = 100
  6. 6.25 + ? = 100
  7. 7.60 + ? = 100
  8. 8.59 + ? = 100
  9. 9.7 + ? = 10
  10. 10.1 + ? = 10
  11. 11.3 + ? = 10
  12. 12.5 + ? = 10
  13. 13.4 + ? = 10
  14. 14.78 + ? = 100
  15. 15.54 + ? = 100
  16. 16.24 + ? = 100
  17. 17.33 + ? = 100
  18. 18.23 + ? = 100
  19. 19.9 + ? = 10
  20. 20.6 + ? = 10
  21. 21.87 + ? = 100
  22. 22.64 + ? = 100
  23. 23.88 + ? = 100
  24. 24.32 + ? = 100
  25. 25.68 + ? = 100
  26. 26.2 + ? = 10
  27. 27.85 + ? = 100
  28. 28.82 + ? = 100
  29. 29.86 + ? = 100
  30. 30.11 + ? = 100
  31. 31.50 + ? = 100
  32. 32.36 + ? = 100
  33. 33.48 + ? = 100
  34. 34.42 + ? = 100
  35. 35.20 + ? = 100
  36. 36.12 + ? = 100
  37. 37.14 + ? = 100
  38. 38.22 + ? = 100
  39. 39.47 + ? = 100
  40. 40.15 + ? = 100

Answer key

  1. 51
  2. 19
  3. 35
  4. 56
  5. 57
  6. 75
  7. 40
  8. 41
  9. 3
  10. 9
  11. 7
  12. 5
  13. 6
  14. 22
  15. 46
  16. 76
  17. 67
  18. 77
  19. 1
  20. 4
  21. 13
  22. 36
  23. 12
  24. 68
  25. 32
  26. 8
  27. 15
  28. 18
  29. 14
  30. 89
  31. 50
  32. 64
  33. 52
  34. 58
  35. 80
  36. 88
  37. 86
  38. 78
  39. 53
  40. 85

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