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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 820 · 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. 1.21 + ? = 100
  2. 2.40 + ? = 100
  3. 3.28 + ? = 100
  4. 4.39 + ? = 100
  5. 5.72 + ? = 100
  6. 6.69 + ? = 100
  7. 7.9 + ? = 10
  8. 8.38 + ? = 100
  9. 9.37 + ? = 100
  10. 10.15 + ? = 100
  11. 11.23 + ? = 100
  12. 12.68 + ? = 100
  13. 13.51 + ? = 100
  14. 14.11 + ? = 100
  15. 15.1 + ? = 10
  16. 16.64 + ? = 100
  17. 17.22 + ? = 100
  18. 18.7 + ? = 10
  19. 19.2 + ? = 10
  20. 20.65 + ? = 100
  21. 21.4 + ? = 10
  22. 22.31 + ? = 100
  23. 23.6 + ? = 10
  24. 24.60 + ? = 100
  25. 25.24 + ? = 100
  26. 26.81 + ? = 100
  27. 27.3 + ? = 10
  28. 28.57 + ? = 100
  29. 29.29 + ? = 100
  30. 30.16 + ? = 100
  31. 31.35 + ? = 100
  32. 32.43 + ? = 100
  33. 33.41 + ? = 100
  34. 34.8 + ? = 10
  35. 35.58 + ? = 100
  36. 36.56 + ? = 100
  37. 37.44 + ? = 100
  38. 38.42 + ? = 100
  39. 39.20 + ? = 100
  40. 40.30 + ? = 100

Answer key

  1. 79
  2. 60
  3. 72
  4. 61
  5. 28
  6. 31
  7. 1
  8. 62
  9. 63
  10. 85
  11. 77
  12. 32
  13. 49
  14. 89
  15. 9
  16. 36
  17. 78
  18. 3
  19. 8
  20. 35
  21. 6
  22. 69
  23. 4
  24. 40
  25. 76
  26. 19
  27. 7
  28. 43
  29. 71
  30. 84
  31. 65
  32. 57
  33. 59
  34. 2
  35. 42
  36. 44
  37. 56
  38. 58
  39. 80
  40. 70

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