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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 912 · 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. 1.7 + ? = 10
  2. 2.89 + ? = 100
  3. 3.55 + ? = 100
  4. 4.79 + ? = 100
  5. 5.63 + ? = 100
  6. 6.71 + ? = 100
  7. 7.44 + ? = 100
  8. 8.5 + ? = 10
  9. 9.80 + ? = 100
  10. 10.2 + ? = 10
  11. 11.19 + ? = 100
  12. 12.1 + ? = 10
  13. 13.52 + ? = 100
  14. 14.42 + ? = 100
  15. 15.8 + ? = 10
  16. 16.87 + ? = 100
  17. 17.58 + ? = 100
  18. 18.59 + ? = 100
  19. 19.4 + ? = 10
  20. 20.15 + ? = 100
  21. 21.43 + ? = 100
  22. 22.6 + ? = 10
  23. 23.33 + ? = 100
  24. 24.84 + ? = 100
  25. 25.36 + ? = 100
  26. 26.64 + ? = 100
  27. 27.39 + ? = 100
  28. 28.3 + ? = 10
  29. 29.86 + ? = 100
  30. 30.47 + ? = 100
  31. 31.31 + ? = 100
  32. 32.13 + ? = 100
  33. 33.27 + ? = 100
  34. 34.62 + ? = 100
  35. 35.18 + ? = 100
  36. 36.23 + ? = 100
  37. 37.61 + ? = 100
  38. 38.30 + ? = 100
  39. 39.29 + ? = 100
  40. 40.26 + ? = 100

Answer key

  1. 3
  2. 11
  3. 45
  4. 21
  5. 37
  6. 29
  7. 56
  8. 5
  9. 20
  10. 8
  11. 81
  12. 9
  13. 48
  14. 58
  15. 2
  16. 13
  17. 42
  18. 41
  19. 6
  20. 85
  21. 57
  22. 4
  23. 67
  24. 16
  25. 64
  26. 36
  27. 61
  28. 7
  29. 14
  30. 53
  31. 69
  32. 87
  33. 73
  34. 38
  35. 82
  36. 77
  37. 39
  38. 70
  39. 71
  40. 74

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