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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 834 · 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. 1.80 + ? = 100
  2. 2.7 + ? = 10
  3. 3.8 + ? = 10
  4. 4.70 + ? = 100
  5. 5.6 + ? = 10
  6. 6.17 + ? = 100
  7. 7.88 + ? = 100
  8. 8.40 + ? = 100
  9. 9.15 + ? = 100
  10. 10.79 + ? = 100
  11. 11.72 + ? = 100
  12. 12.12 + ? = 100
  13. 13.13 + ? = 100
  14. 14.66 + ? = 100
  15. 15.29 + ? = 100
  16. 16.5 + ? = 10
  17. 17.3 + ? = 10
  18. 18.49 + ? = 100
  19. 19.2 + ? = 10
  20. 20.9 + ? = 10
  21. 21.4 + ? = 10
  22. 22.16 + ? = 100
  23. 23.82 + ? = 100
  24. 24.25 + ? = 100
  25. 25.65 + ? = 100
  26. 26.75 + ? = 100
  27. 27.18 + ? = 100
  28. 28.60 + ? = 100
  29. 29.23 + ? = 100
  30. 30.1 + ? = 10
  31. 31.61 + ? = 100
  32. 32.55 + ? = 100
  33. 33.78 + ? = 100
  34. 34.35 + ? = 100
  35. 35.63 + ? = 100
  36. 36.11 + ? = 100
  37. 37.84 + ? = 100
  38. 38.45 + ? = 100
  39. 39.38 + ? = 100
  40. 40.20 + ? = 100

Answer key

  1. 20
  2. 3
  3. 2
  4. 30
  5. 4
  6. 83
  7. 12
  8. 60
  9. 85
  10. 21
  11. 28
  12. 88
  13. 87
  14. 34
  15. 71
  16. 5
  17. 7
  18. 51
  19. 8
  20. 1
  21. 6
  22. 84
  23. 18
  24. 75
  25. 35
  26. 25
  27. 82
  28. 40
  29. 77
  30. 9
  31. 39
  32. 45
  33. 22
  34. 65
  35. 37
  36. 89
  37. 16
  38. 55
  39. 62
  40. 80

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