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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 800 · 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. 2.82 + ? = 100
  3. 3.8 + ? = 10
  4. 4.4 + ? = 10
  5. 5.23 + ? = 100
  6. 6.30 + ? = 100
  7. 7.24 + ? = 100
  8. 8.1 + ? = 10
  9. 9.67 + ? = 100
  10. 10.16 + ? = 100
  11. 11.2 + ? = 10
  12. 12.3 + ? = 10
  13. 13.79 + ? = 100
  14. 14.9 + ? = 10
  15. 15.5 + ? = 10
  16. 16.29 + ? = 100
  17. 17.7 + ? = 10
  18. 18.19 + ? = 100
  19. 19.26 + ? = 100
  20. 20.71 + ? = 100
  21. 21.34 + ? = 100
  22. 22.33 + ? = 100
  23. 23.61 + ? = 100
  24. 24.89 + ? = 100
  25. 25.21 + ? = 100
  26. 26.39 + ? = 100
  27. 27.49 + ? = 100
  28. 28.41 + ? = 100
  29. 29.32 + ? = 100
  30. 30.85 + ? = 100
  31. 31.74 + ? = 100
  32. 32.87 + ? = 100
  33. 33.54 + ? = 100
  34. 34.62 + ? = 100
  35. 35.83 + ? = 100
  36. 36.17 + ? = 100
  37. 37.50 + ? = 100
  38. 38.88 + ? = 100
  39. 39.55 + ? = 100
  40. 40.37 + ? = 100

Answer key

  1. 4
  2. 18
  3. 2
  4. 6
  5. 77
  6. 70
  7. 76
  8. 9
  9. 33
  10. 84
  11. 8
  12. 7
  13. 21
  14. 1
  15. 5
  16. 71
  17. 3
  18. 81
  19. 74
  20. 29
  21. 66
  22. 67
  23. 39
  24. 11
  25. 79
  26. 61
  27. 51
  28. 59
  29. 68
  30. 15
  31. 26
  32. 13
  33. 46
  34. 38
  35. 17
  36. 83
  37. 50
  38. 12
  39. 45
  40. 63

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