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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 789 · 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. 1.23 + ? = 100
  2. 2.2 + ? = 10
  3. 3.6 + ? = 10
  4. 4.77 + ? = 100
  5. 5.4 + ? = 10
  6. 6.1 + ? = 10
  7. 7.61 + ? = 100
  8. 8.39 + ? = 100
  9. 9.67 + ? = 100
  10. 10.3 + ? = 10
  11. 11.9 + ? = 10
  12. 12.73 + ? = 100
  13. 13.59 + ? = 100
  14. 14.5 + ? = 10
  15. 15.74 + ? = 100
  16. 16.22 + ? = 100
  17. 17.45 + ? = 100
  18. 18.71 + ? = 100
  19. 19.17 + ? = 100
  20. 20.38 + ? = 100
  21. 21.26 + ? = 100
  22. 22.18 + ? = 100
  23. 23.7 + ? = 10
  24. 24.89 + ? = 100
  25. 25.31 + ? = 100
  26. 26.66 + ? = 100
  27. 27.60 + ? = 100
  28. 28.34 + ? = 100
  29. 29.55 + ? = 100
  30. 30.37 + ? = 100
  31. 31.63 + ? = 100
  32. 32.8 + ? = 10
  33. 33.78 + ? = 100
  34. 34.12 + ? = 100
  35. 35.21 + ? = 100
  36. 36.81 + ? = 100
  37. 37.46 + ? = 100
  38. 38.52 + ? = 100
  39. 39.79 + ? = 100
  40. 40.30 + ? = 100

Answer key

  1. 77
  2. 8
  3. 4
  4. 23
  5. 6
  6. 9
  7. 39
  8. 61
  9. 33
  10. 7
  11. 1
  12. 27
  13. 41
  14. 5
  15. 26
  16. 78
  17. 55
  18. 29
  19. 83
  20. 62
  21. 74
  22. 82
  23. 3
  24. 11
  25. 69
  26. 34
  27. 40
  28. 66
  29. 45
  30. 63
  31. 37
  32. 2
  33. 22
  34. 88
  35. 79
  36. 19
  37. 54
  38. 48
  39. 21
  40. 70

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