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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 991 · 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. 1.19 + ? = 100
  2. 2.3 + ? = 10
  3. 3.56 + ? = 100
  4. 4.5 + ? = 10
  5. 5.76 + ? = 100
  6. 6.4 + ? = 10
  7. 7.51 + ? = 100
  8. 8.1 + ? = 10
  9. 9.32 + ? = 100
  10. 10.21 + ? = 100
  11. 11.44 + ? = 100
  12. 12.39 + ? = 100
  13. 13.6 + ? = 10
  14. 14.2 + ? = 10
  15. 15.7 + ? = 10
  16. 16.82 + ? = 100
  17. 17.9 + ? = 10
  18. 18.42 + ? = 100
  19. 19.8 + ? = 10
  20. 20.34 + ? = 100
  21. 21.33 + ? = 100
  22. 22.25 + ? = 100
  23. 23.59 + ? = 100
  24. 24.60 + ? = 100
  25. 25.22 + ? = 100
  26. 26.86 + ? = 100
  27. 27.78 + ? = 100
  28. 28.20 + ? = 100
  29. 29.48 + ? = 100
  30. 30.18 + ? = 100
  31. 31.38 + ? = 100
  32. 32.24 + ? = 100
  33. 33.35 + ? = 100
  34. 34.29 + ? = 100
  35. 35.64 + ? = 100
  36. 36.54 + ? = 100
  37. 37.15 + ? = 100
  38. 38.83 + ? = 100
  39. 39.46 + ? = 100
  40. 40.58 + ? = 100

Answer key

  1. 81
  2. 7
  3. 44
  4. 5
  5. 24
  6. 6
  7. 49
  8. 9
  9. 68
  10. 79
  11. 56
  12. 61
  13. 4
  14. 8
  15. 3
  16. 18
  17. 1
  18. 58
  19. 2
  20. 66
  21. 67
  22. 75
  23. 41
  24. 40
  25. 78
  26. 14
  27. 22
  28. 80
  29. 52
  30. 82
  31. 62
  32. 76
  33. 65
  34. 71
  35. 36
  36. 46
  37. 85
  38. 17
  39. 54
  40. 42

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