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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 837 · 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. 1.25 + ? = 100
  2. 2.1 + ? = 10
  3. 3.35 + ? = 100
  4. 4.76 + ? = 100
  5. 5.9 + ? = 10
  6. 6.8 + ? = 10
  7. 7.16 + ? = 100
  8. 8.19 + ? = 100
  9. 9.5 + ? = 10
  10. 10.46 + ? = 100
  11. 11.79 + ? = 100
  12. 12.26 + ? = 100
  13. 13.12 + ? = 100
  14. 14.29 + ? = 100
  15. 15.64 + ? = 100
  16. 16.36 + ? = 100
  17. 17.3 + ? = 10
  18. 18.53 + ? = 100
  19. 19.7 + ? = 10
  20. 20.65 + ? = 100
  21. 21.6 + ? = 10
  22. 22.84 + ? = 100
  23. 23.38 + ? = 100
  24. 24.66 + ? = 100
  25. 25.2 + ? = 10
  26. 26.11 + ? = 100
  27. 27.83 + ? = 100
  28. 28.58 + ? = 100
  29. 29.74 + ? = 100
  30. 30.4 + ? = 10
  31. 31.88 + ? = 100
  32. 32.32 + ? = 100
  33. 33.39 + ? = 100
  34. 34.85 + ? = 100
  35. 35.50 + ? = 100
  36. 36.44 + ? = 100
  37. 37.33 + ? = 100
  38. 38.57 + ? = 100
  39. 39.62 + ? = 100
  40. 40.82 + ? = 100

Answer key

  1. 75
  2. 9
  3. 65
  4. 24
  5. 1
  6. 2
  7. 84
  8. 81
  9. 5
  10. 54
  11. 21
  12. 74
  13. 88
  14. 71
  15. 36
  16. 64
  17. 7
  18. 47
  19. 3
  20. 35
  21. 4
  22. 16
  23. 62
  24. 34
  25. 8
  26. 89
  27. 17
  28. 42
  29. 26
  30. 6
  31. 12
  32. 68
  33. 61
  34. 15
  35. 50
  36. 56
  37. 67
  38. 43
  39. 38
  40. 18

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