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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 843 · 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. 1.87 + ? = 100
  2. 2.20 + ? = 100
  3. 3.16 + ? = 100
  4. 4.25 + ? = 100
  5. 5.47 + ? = 100
  6. 6.4 + ? = 10
  7. 7.54 + ? = 100
  8. 8.1 + ? = 10
  9. 9.23 + ? = 100
  10. 10.27 + ? = 100
  11. 11.70 + ? = 100
  12. 12.49 + ? = 100
  13. 13.86 + ? = 100
  14. 14.14 + ? = 100
  15. 15.9 + ? = 10
  16. 16.3 + ? = 10
  17. 17.7 + ? = 10
  18. 18.74 + ? = 100
  19. 19.38 + ? = 100
  20. 20.28 + ? = 100
  21. 21.12 + ? = 100
  22. 22.6 + ? = 10
  23. 23.5 + ? = 10
  24. 24.8 + ? = 10
  25. 25.84 + ? = 100
  26. 26.89 + ? = 100
  27. 27.15 + ? = 100
  28. 28.11 + ? = 100
  29. 29.40 + ? = 100
  30. 30.2 + ? = 10
  31. 31.46 + ? = 100
  32. 32.83 + ? = 100
  33. 33.32 + ? = 100
  34. 34.24 + ? = 100
  35. 35.31 + ? = 100
  36. 36.76 + ? = 100
  37. 37.79 + ? = 100
  38. 38.29 + ? = 100
  39. 39.50 + ? = 100
  40. 40.69 + ? = 100

Answer key

  1. 13
  2. 80
  3. 84
  4. 75
  5. 53
  6. 6
  7. 46
  8. 9
  9. 77
  10. 73
  11. 30
  12. 51
  13. 14
  14. 86
  15. 1
  16. 7
  17. 3
  18. 26
  19. 62
  20. 72
  21. 88
  22. 4
  23. 5
  24. 2
  25. 16
  26. 11
  27. 85
  28. 89
  29. 60
  30. 8
  31. 54
  32. 17
  33. 68
  34. 76
  35. 69
  36. 24
  37. 21
  38. 71
  39. 50
  40. 31

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