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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 775 · 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. 1.2 + ? = 10
  2. 2.51 + ? = 100
  3. 3.39 + ? = 100
  4. 4.1 + ? = 10
  5. 5.5 + ? = 10
  6. 6.3 + ? = 10
  7. 7.56 + ? = 100
  8. 8.32 + ? = 100
  9. 9.22 + ? = 100
  10. 10.17 + ? = 100
  11. 11.60 + ? = 100
  12. 12.54 + ? = 100
  13. 13.80 + ? = 100
  14. 14.18 + ? = 100
  15. 15.4 + ? = 10
  16. 16.9 + ? = 10
  17. 17.8 + ? = 10
  18. 18.55 + ? = 100
  19. 19.86 + ? = 100
  20. 20.20 + ? = 100
  21. 21.63 + ? = 100
  22. 22.37 + ? = 100
  23. 23.74 + ? = 100
  24. 24.78 + ? = 100
  25. 25.43 + ? = 100
  26. 26.13 + ? = 100
  27. 27.19 + ? = 100
  28. 28.34 + ? = 100
  29. 29.24 + ? = 100
  30. 30.50 + ? = 100
  31. 31.6 + ? = 10
  32. 32.29 + ? = 100
  33. 33.70 + ? = 100
  34. 34.25 + ? = 100
  35. 35.30 + ? = 100
  36. 36.14 + ? = 100
  37. 37.64 + ? = 100
  38. 38.68 + ? = 100
  39. 39.82 + ? = 100
  40. 40.7 + ? = 10

Answer key

  1. 8
  2. 49
  3. 61
  4. 9
  5. 5
  6. 7
  7. 44
  8. 68
  9. 78
  10. 83
  11. 40
  12. 46
  13. 20
  14. 82
  15. 6
  16. 1
  17. 2
  18. 45
  19. 14
  20. 80
  21. 37
  22. 63
  23. 26
  24. 22
  25. 57
  26. 87
  27. 81
  28. 66
  29. 76
  30. 50
  31. 4
  32. 71
  33. 30
  34. 75
  35. 70
  36. 86
  37. 36
  38. 32
  39. 18
  40. 3

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