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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 684 · 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. 1.80 + ? = 100
  2. 2.5 + ? = 10
  3. 3.4 + ? = 10
  4. 4.13 + ? = 100
  5. 5.27 + ? = 100
  6. 6.2 + ? = 10
  7. 7.3 + ? = 10
  8. 8.34 + ? = 100
  9. 9.53 + ? = 100
  10. 10.82 + ? = 100
  11. 11.72 + ? = 100
  12. 12.59 + ? = 100
  13. 13.6 + ? = 10
  14. 14.78 + ? = 100
  15. 15.68 + ? = 100
  16. 16.7 + ? = 10
  17. 17.32 + ? = 100
  18. 18.9 + ? = 10
  19. 19.25 + ? = 100
  20. 20.1 + ? = 10
  21. 21.11 + ? = 100
  22. 22.8 + ? = 10
  23. 23.36 + ? = 100
  24. 24.77 + ? = 100
  25. 25.31 + ? = 100
  26. 26.30 + ? = 100
  27. 27.85 + ? = 100
  28. 28.26 + ? = 100
  29. 29.51 + ? = 100
  30. 30.66 + ? = 100
  31. 31.33 + ? = 100
  32. 32.38 + ? = 100
  33. 33.61 + ? = 100
  34. 34.22 + ? = 100
  35. 35.45 + ? = 100
  36. 36.24 + ? = 100
  37. 37.14 + ? = 100
  38. 38.87 + ? = 100
  39. 39.84 + ? = 100
  40. 40.42 + ? = 100

Answer key

  1. 20
  2. 5
  3. 6
  4. 87
  5. 73
  6. 8
  7. 7
  8. 66
  9. 47
  10. 18
  11. 28
  12. 41
  13. 4
  14. 22
  15. 32
  16. 3
  17. 68
  18. 1
  19. 75
  20. 9
  21. 89
  22. 2
  23. 64
  24. 23
  25. 69
  26. 70
  27. 15
  28. 74
  29. 49
  30. 34
  31. 67
  32. 62
  33. 39
  34. 78
  35. 55
  36. 76
  37. 86
  38. 13
  39. 16
  40. 58

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