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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 902 · 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. 1.34 + ? = 100
  2. 2.60 + ? = 100
  3. 3.70 + ? = 100
  4. 4.6 + ? = 10
  5. 5.18 + ? = 100
  6. 6.5 + ? = 10
  7. 7.77 + ? = 100
  8. 8.50 + ? = 100
  9. 9.23 + ? = 100
  10. 10.4 + ? = 10
  11. 11.27 + ? = 100
  12. 12.3 + ? = 10
  13. 13.43 + ? = 100
  14. 14.2 + ? = 10
  15. 15.41 + ? = 100
  16. 16.83 + ? = 100
  17. 17.16 + ? = 100
  18. 18.32 + ? = 100
  19. 19.31 + ? = 100
  20. 20.20 + ? = 100
  21. 21.68 + ? = 100
  22. 22.30 + ? = 100
  23. 23.86 + ? = 100
  24. 24.44 + ? = 100
  25. 25.1 + ? = 10
  26. 26.8 + ? = 10
  27. 27.7 + ? = 10
  28. 28.76 + ? = 100
  29. 29.12 + ? = 100
  30. 30.88 + ? = 100
  31. 31.39 + ? = 100
  32. 32.9 + ? = 10
  33. 33.58 + ? = 100
  34. 34.38 + ? = 100
  35. 35.28 + ? = 100
  36. 36.79 + ? = 100
  37. 37.65 + ? = 100
  38. 38.14 + ? = 100
  39. 39.81 + ? = 100
  40. 40.45 + ? = 100

Answer key

  1. 66
  2. 40
  3. 30
  4. 4
  5. 82
  6. 5
  7. 23
  8. 50
  9. 77
  10. 6
  11. 73
  12. 7
  13. 57
  14. 8
  15. 59
  16. 17
  17. 84
  18. 68
  19. 69
  20. 80
  21. 32
  22. 70
  23. 14
  24. 56
  25. 9
  26. 2
  27. 3
  28. 24
  29. 88
  30. 12
  31. 61
  32. 1
  33. 42
  34. 62
  35. 72
  36. 21
  37. 35
  38. 86
  39. 19
  40. 55

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