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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 847 · 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. 1.1 + ? = 10
  2. 2.58 + ? = 100
  3. 3.3 + ? = 10
  4. 4.39 + ? = 100
  5. 5.7 + ? = 10
  6. 6.6 + ? = 10
  7. 7.17 + ? = 100
  8. 8.15 + ? = 100
  9. 9.63 + ? = 100
  10. 10.8 + ? = 10
  11. 11.29 + ? = 100
  12. 12.45 + ? = 100
  13. 13.20 + ? = 100
  14. 14.61 + ? = 100
  15. 15.30 + ? = 100
  16. 16.5 + ? = 10
  17. 17.4 + ? = 10
  18. 18.2 + ? = 10
  19. 19.9 + ? = 10
  20. 20.72 + ? = 100
  21. 21.49 + ? = 100
  22. 22.41 + ? = 100
  23. 23.85 + ? = 100
  24. 24.35 + ? = 100
  25. 25.13 + ? = 100
  26. 26.28 + ? = 100
  27. 27.55 + ? = 100
  28. 28.18 + ? = 100
  29. 29.71 + ? = 100
  30. 30.14 + ? = 100
  31. 31.76 + ? = 100
  32. 32.80 + ? = 100
  33. 33.22 + ? = 100
  34. 34.33 + ? = 100
  35. 35.32 + ? = 100
  36. 36.40 + ? = 100
  37. 37.65 + ? = 100
  38. 38.75 + ? = 100
  39. 39.84 + ? = 100
  40. 40.74 + ? = 100

Answer key

  1. 9
  2. 42
  3. 7
  4. 61
  5. 3
  6. 4
  7. 83
  8. 85
  9. 37
  10. 2
  11. 71
  12. 55
  13. 80
  14. 39
  15. 70
  16. 5
  17. 6
  18. 8
  19. 1
  20. 28
  21. 51
  22. 59
  23. 15
  24. 65
  25. 87
  26. 72
  27. 45
  28. 82
  29. 29
  30. 86
  31. 24
  32. 20
  33. 78
  34. 67
  35. 68
  36. 60
  37. 35
  38. 25
  39. 16
  40. 26

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