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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 839 · 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. 1.1 + ? = 10
  2. 2.15 + ? = 100
  3. 3.4 + ? = 10
  4. 4.39 + ? = 100
  5. 5.79 + ? = 100
  6. 6.5 + ? = 10
  7. 7.2 + ? = 10
  8. 8.27 + ? = 100
  9. 9.59 + ? = 100
  10. 10.85 + ? = 100
  11. 11.34 + ? = 100
  12. 12.33 + ? = 100
  13. 13.84 + ? = 100
  14. 14.12 + ? = 100
  15. 15.35 + ? = 100
  16. 16.47 + ? = 100
  17. 17.8 + ? = 10
  18. 18.22 + ? = 100
  19. 19.67 + ? = 100
  20. 20.17 + ? = 100
  21. 21.43 + ? = 100
  22. 22.51 + ? = 100
  23. 23.29 + ? = 100
  24. 24.42 + ? = 100
  25. 25.88 + ? = 100
  26. 26.7 + ? = 10
  27. 27.3 + ? = 10
  28. 28.62 + ? = 100
  29. 29.28 + ? = 100
  30. 30.6 + ? = 10
  31. 31.37 + ? = 100
  32. 32.14 + ? = 100
  33. 33.11 + ? = 100
  34. 34.57 + ? = 100
  35. 35.80 + ? = 100
  36. 36.18 + ? = 100
  37. 37.73 + ? = 100
  38. 38.13 + ? = 100
  39. 39.24 + ? = 100
  40. 40.9 + ? = 10

Answer key

  1. 9
  2. 85
  3. 6
  4. 61
  5. 21
  6. 5
  7. 8
  8. 73
  9. 41
  10. 15
  11. 66
  12. 67
  13. 16
  14. 88
  15. 65
  16. 53
  17. 2
  18. 78
  19. 33
  20. 83
  21. 57
  22. 49
  23. 71
  24. 58
  25. 12
  26. 3
  27. 7
  28. 38
  29. 72
  30. 4
  31. 63
  32. 86
  33. 89
  34. 43
  35. 20
  36. 82
  37. 27
  38. 87
  39. 76
  40. 1

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