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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 813 · 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. 1.62 + ? = 100
  2. 2.80 + ? = 100
  3. 3.47 + ? = 100
  4. 4.7 + ? = 10
  5. 5.8 + ? = 10
  6. 6.79 + ? = 100
  7. 7.1 + ? = 10
  8. 8.86 + ? = 100
  9. 9.11 + ? = 100
  10. 10.74 + ? = 100
  11. 11.60 + ? = 100
  12. 12.3 + ? = 10
  13. 13.42 + ? = 100
  14. 14.40 + ? = 100
  15. 15.50 + ? = 100
  16. 16.31 + ? = 100
  17. 17.45 + ? = 100
  18. 18.2 + ? = 10
  19. 19.4 + ? = 10
  20. 20.56 + ? = 100
  21. 21.17 + ? = 100
  22. 22.15 + ? = 100
  23. 23.54 + ? = 100
  24. 24.61 + ? = 100
  25. 25.87 + ? = 100
  26. 26.6 + ? = 10
  27. 27.68 + ? = 100
  28. 28.19 + ? = 100
  29. 29.24 + ? = 100
  30. 30.28 + ? = 100
  31. 31.75 + ? = 100
  32. 32.39 + ? = 100
  33. 33.34 + ? = 100
  34. 34.38 + ? = 100
  35. 35.5 + ? = 10
  36. 36.9 + ? = 10
  37. 37.46 + ? = 100
  38. 38.81 + ? = 100
  39. 39.66 + ? = 100
  40. 40.64 + ? = 100

Answer key

  1. 38
  2. 20
  3. 53
  4. 3
  5. 2
  6. 21
  7. 9
  8. 14
  9. 89
  10. 26
  11. 40
  12. 7
  13. 58
  14. 60
  15. 50
  16. 69
  17. 55
  18. 8
  19. 6
  20. 44
  21. 83
  22. 85
  23. 46
  24. 39
  25. 13
  26. 4
  27. 32
  28. 81
  29. 76
  30. 72
  31. 25
  32. 61
  33. 66
  34. 62
  35. 5
  36. 1
  37. 54
  38. 19
  39. 34
  40. 36

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