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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 919 · 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. 1.4 + ? = 10
  2. 2.3 + ? = 10
  3. 3.2 + ? = 10
  4. 4.9 + ? = 10
  5. 5.7 + ? = 10
  6. 6.16 + ? = 100
  7. 7.6 + ? = 10
  8. 8.18 + ? = 100
  9. 9.81 + ? = 100
  10. 10.24 + ? = 100
  11. 11.60 + ? = 100
  12. 12.54 + ? = 100
  13. 13.26 + ? = 100
  14. 14.82 + ? = 100
  15. 15.28 + ? = 100
  16. 16.33 + ? = 100
  17. 17.11 + ? = 100
  18. 18.8 + ? = 10
  19. 19.25 + ? = 100
  20. 20.19 + ? = 100
  21. 21.5 + ? = 10
  22. 22.78 + ? = 100
  23. 23.87 + ? = 100
  24. 24.58 + ? = 100
  25. 25.41 + ? = 100
  26. 26.20 + ? = 100
  27. 27.65 + ? = 100
  28. 28.36 + ? = 100
  29. 29.52 + ? = 100
  30. 30.1 + ? = 10
  31. 31.86 + ? = 100
  32. 32.67 + ? = 100
  33. 33.75 + ? = 100
  34. 34.30 + ? = 100
  35. 35.72 + ? = 100
  36. 36.56 + ? = 100
  37. 37.39 + ? = 100
  38. 38.38 + ? = 100
  39. 39.83 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 6
  2. 7
  3. 8
  4. 1
  5. 3
  6. 84
  7. 4
  8. 82
  9. 19
  10. 76
  11. 40
  12. 46
  13. 74
  14. 18
  15. 72
  16. 67
  17. 89
  18. 2
  19. 75
  20. 81
  21. 5
  22. 22
  23. 13
  24. 42
  25. 59
  26. 80
  27. 35
  28. 64
  29. 48
  30. 9
  31. 14
  32. 33
  33. 25
  34. 70
  35. 28
  36. 44
  37. 61
  38. 62
  39. 17
  40. 66

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