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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 830 · 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. 1.58 + ? = 100
  2. 2.19 + ? = 100
  3. 3.29 + ? = 100
  4. 4.21 + ? = 100
  5. 5.26 + ? = 100
  6. 6.32 + ? = 100
  7. 7.9 + ? = 10
  8. 8.2 + ? = 10
  9. 9.1 + ? = 10
  10. 10.83 + ? = 100
  11. 11.5 + ? = 10
  12. 12.4 + ? = 10
  13. 13.7 + ? = 10
  14. 14.6 + ? = 10
  15. 15.71 + ? = 100
  16. 16.28 + ? = 100
  17. 17.3 + ? = 10
  18. 18.75 + ? = 100
  19. 19.49 + ? = 100
  20. 20.8 + ? = 10
  21. 21.60 + ? = 100
  22. 22.34 + ? = 100
  23. 23.23 + ? = 100
  24. 24.85 + ? = 100
  25. 25.22 + ? = 100
  26. 26.14 + ? = 100
  27. 27.39 + ? = 100
  28. 28.69 + ? = 100
  29. 29.45 + ? = 100
  30. 30.17 + ? = 100
  31. 31.51 + ? = 100
  32. 32.24 + ? = 100
  33. 33.30 + ? = 100
  34. 34.74 + ? = 100
  35. 35.55 + ? = 100
  36. 36.20 + ? = 100
  37. 37.11 + ? = 100
  38. 38.46 + ? = 100
  39. 39.68 + ? = 100
  40. 40.70 + ? = 100

Answer key

  1. 42
  2. 81
  3. 71
  4. 79
  5. 74
  6. 68
  7. 1
  8. 8
  9. 9
  10. 17
  11. 5
  12. 6
  13. 3
  14. 4
  15. 29
  16. 72
  17. 7
  18. 25
  19. 51
  20. 2
  21. 40
  22. 66
  23. 77
  24. 15
  25. 78
  26. 86
  27. 61
  28. 31
  29. 55
  30. 83
  31. 49
  32. 76
  33. 70
  34. 26
  35. 45
  36. 80
  37. 89
  38. 54
  39. 32
  40. 30

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