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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 856 · 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. 1.17 + ? = 100
  2. 2.88 + ? = 100
  3. 3.73 + ? = 100
  4. 4.7 + ? = 10
  5. 5.5 + ? = 10
  6. 6.1 + ? = 10
  7. 7.39 + ? = 100
  8. 8.34 + ? = 100
  9. 9.48 + ? = 100
  10. 10.2 + ? = 10
  11. 11.29 + ? = 100
  12. 12.21 + ? = 100
  13. 13.6 + ? = 10
  14. 14.40 + ? = 100
  15. 15.82 + ? = 100
  16. 16.3 + ? = 10
  17. 17.4 + ? = 10
  18. 18.9 + ? = 10
  19. 19.37 + ? = 100
  20. 20.62 + ? = 100
  21. 21.65 + ? = 100
  22. 22.71 + ? = 100
  23. 23.16 + ? = 100
  24. 24.20 + ? = 100
  25. 25.25 + ? = 100
  26. 26.61 + ? = 100
  27. 27.8 + ? = 10
  28. 28.59 + ? = 100
  29. 29.50 + ? = 100
  30. 30.81 + ? = 100
  31. 31.11 + ? = 100
  32. 32.43 + ? = 100
  33. 33.79 + ? = 100
  34. 34.67 + ? = 100
  35. 35.86 + ? = 100
  36. 36.24 + ? = 100
  37. 37.78 + ? = 100
  38. 38.84 + ? = 100
  39. 39.47 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 83
  2. 12
  3. 27
  4. 3
  5. 5
  6. 9
  7. 61
  8. 66
  9. 52
  10. 8
  11. 71
  12. 79
  13. 4
  14. 60
  15. 18
  16. 7
  17. 6
  18. 1
  19. 63
  20. 38
  21. 35
  22. 29
  23. 84
  24. 80
  25. 75
  26. 39
  27. 2
  28. 41
  29. 50
  30. 19
  31. 89
  32. 57
  33. 21
  34. 33
  35. 14
  36. 76
  37. 22
  38. 16
  39. 53
  40. 81

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