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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 989 · 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. 1.58 + ? = 100
  2. 2.17 + ? = 100
  3. 3.7 + ? = 10
  4. 4.54 + ? = 100
  5. 5.16 + ? = 100
  6. 6.24 + ? = 100
  7. 7.2 + ? = 10
  8. 8.4 + ? = 10
  9. 9.71 + ? = 100
  10. 10.65 + ? = 100
  11. 11.39 + ? = 100
  12. 12.51 + ? = 100
  13. 13.5 + ? = 10
  14. 14.78 + ? = 100
  15. 15.9 + ? = 10
  16. 16.1 + ? = 10
  17. 17.3 + ? = 10
  18. 18.13 + ? = 100
  19. 19.36 + ? = 100
  20. 20.30 + ? = 100
  21. 21.49 + ? = 100
  22. 22.20 + ? = 100
  23. 23.60 + ? = 100
  24. 24.31 + ? = 100
  25. 25.85 + ? = 100
  26. 26.73 + ? = 100
  27. 27.34 + ? = 100
  28. 28.19 + ? = 100
  29. 29.8 + ? = 10
  30. 30.62 + ? = 100
  31. 31.55 + ? = 100
  32. 32.25 + ? = 100
  33. 33.27 + ? = 100
  34. 34.83 + ? = 100
  35. 35.88 + ? = 100
  36. 36.35 + ? = 100
  37. 37.14 + ? = 100
  38. 38.76 + ? = 100
  39. 39.21 + ? = 100
  40. 40.46 + ? = 100

Answer key

  1. 42
  2. 83
  3. 3
  4. 46
  5. 84
  6. 76
  7. 8
  8. 6
  9. 29
  10. 35
  11. 61
  12. 49
  13. 5
  14. 22
  15. 1
  16. 9
  17. 7
  18. 87
  19. 64
  20. 70
  21. 51
  22. 80
  23. 40
  24. 69
  25. 15
  26. 27
  27. 66
  28. 81
  29. 2
  30. 38
  31. 45
  32. 75
  33. 73
  34. 17
  35. 12
  36. 65
  37. 86
  38. 24
  39. 79
  40. 54

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