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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 972 · 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. 1.5 + ? = 10
  2. 2.4 + ? = 10
  3. 3.40 + ? = 100
  4. 4.9 + ? = 10
  5. 5.3 + ? = 10
  6. 6.2 + ? = 10
  7. 7.6 + ? = 10
  8. 8.1 + ? = 10
  9. 9.45 + ? = 100
  10. 10.18 + ? = 100
  11. 11.66 + ? = 100
  12. 12.48 + ? = 100
  13. 13.84 + ? = 100
  14. 14.69 + ? = 100
  15. 15.7 + ? = 10
  16. 16.20 + ? = 100
  17. 17.17 + ? = 100
  18. 18.72 + ? = 100
  19. 19.76 + ? = 100
  20. 20.21 + ? = 100
  21. 21.65 + ? = 100
  22. 22.56 + ? = 100
  23. 23.43 + ? = 100
  24. 24.36 + ? = 100
  25. 25.89 + ? = 100
  26. 26.44 + ? = 100
  27. 27.27 + ? = 100
  28. 28.8 + ? = 10
  29. 29.49 + ? = 100
  30. 30.32 + ? = 100
  31. 31.24 + ? = 100
  32. 32.39 + ? = 100
  33. 33.51 + ? = 100
  34. 34.75 + ? = 100
  35. 35.64 + ? = 100
  36. 36.78 + ? = 100
  37. 37.57 + ? = 100
  38. 38.87 + ? = 100
  39. 39.38 + ? = 100
  40. 40.42 + ? = 100

Answer key

  1. 5
  2. 6
  3. 60
  4. 1
  5. 7
  6. 8
  7. 4
  8. 9
  9. 55
  10. 82
  11. 34
  12. 52
  13. 16
  14. 31
  15. 3
  16. 80
  17. 83
  18. 28
  19. 24
  20. 79
  21. 35
  22. 44
  23. 57
  24. 64
  25. 11
  26. 56
  27. 73
  28. 2
  29. 51
  30. 68
  31. 76
  32. 61
  33. 49
  34. 25
  35. 36
  36. 22
  37. 43
  38. 13
  39. 62
  40. 58

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