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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 870 · 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. 1.6 + ? = 10
  2. 2.5 + ? = 10
  3. 3.7 + ? = 10
  4. 4.82 + ? = 100
  5. 5.4 + ? = 10
  6. 6.65 + ? = 100
  7. 7.3 + ? = 10
  8. 8.1 + ? = 10
  9. 9.9 + ? = 10
  10. 10.80 + ? = 100
  11. 11.66 + ? = 100
  12. 12.62 + ? = 100
  13. 13.8 + ? = 10
  14. 14.29 + ? = 100
  15. 15.13 + ? = 100
  16. 16.64 + ? = 100
  17. 17.75 + ? = 100
  18. 18.33 + ? = 100
  19. 19.35 + ? = 100
  20. 20.2 + ? = 10
  21. 21.19 + ? = 100
  22. 22.56 + ? = 100
  23. 23.77 + ? = 100
  24. 24.12 + ? = 100
  25. 25.78 + ? = 100
  26. 26.39 + ? = 100
  27. 27.45 + ? = 100
  28. 28.73 + ? = 100
  29. 29.71 + ? = 100
  30. 30.34 + ? = 100
  31. 31.38 + ? = 100
  32. 32.27 + ? = 100
  33. 33.21 + ? = 100
  34. 34.37 + ? = 100
  35. 35.70 + ? = 100
  36. 36.61 + ? = 100
  37. 37.42 + ? = 100
  38. 38.31 + ? = 100
  39. 39.32 + ? = 100
  40. 40.14 + ? = 100

Answer key

  1. 4
  2. 5
  3. 3
  4. 18
  5. 6
  6. 35
  7. 7
  8. 9
  9. 1
  10. 20
  11. 34
  12. 38
  13. 2
  14. 71
  15. 87
  16. 36
  17. 25
  18. 67
  19. 65
  20. 8
  21. 81
  22. 44
  23. 23
  24. 88
  25. 22
  26. 61
  27. 55
  28. 27
  29. 29
  30. 66
  31. 62
  32. 73
  33. 79
  34. 63
  35. 30
  36. 39
  37. 58
  38. 69
  39. 68
  40. 86

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