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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 152 · 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. 1.32 + ? = 100
  2. 2.18 + ? = 100
  3. 3.50 + ? = 100
  4. 4.68 + ? = 100
  5. 5.85 + ? = 100
  6. 6.6 + ? = 10
  7. 7.8 + ? = 10
  8. 8.3 + ? = 10
  9. 9.12 + ? = 100
  10. 10.33 + ? = 100
  11. 11.4 + ? = 10
  12. 12.2 + ? = 10
  13. 13.60 + ? = 100
  14. 14.23 + ? = 100
  15. 15.62 + ? = 100
  16. 16.5 + ? = 10
  17. 17.28 + ? = 100
  18. 18.78 + ? = 100
  19. 19.82 + ? = 100
  20. 20.49 + ? = 100
  21. 21.1 + ? = 10
  22. 22.59 + ? = 100
  23. 23.51 + ? = 100
  24. 24.67 + ? = 100
  25. 25.70 + ? = 100
  26. 26.73 + ? = 100
  27. 27.21 + ? = 100
  28. 28.11 + ? = 100
  29. 29.20 + ? = 100
  30. 30.79 + ? = 100
  31. 31.40 + ? = 100
  32. 32.69 + ? = 100
  33. 33.30 + ? = 100
  34. 34.83 + ? = 100
  35. 35.17 + ? = 100
  36. 36.87 + ? = 100
  37. 37.25 + ? = 100
  38. 38.63 + ? = 100
  39. 39.14 + ? = 100
  40. 40.64 + ? = 100

Answer key

  1. 68
  2. 82
  3. 50
  4. 32
  5. 15
  6. 4
  7. 2
  8. 7
  9. 88
  10. 67
  11. 6
  12. 8
  13. 40
  14. 77
  15. 38
  16. 5
  17. 72
  18. 22
  19. 18
  20. 51
  21. 9
  22. 41
  23. 49
  24. 33
  25. 30
  26. 27
  27. 79
  28. 89
  29. 80
  30. 21
  31. 60
  32. 31
  33. 70
  34. 17
  35. 83
  36. 13
  37. 75
  38. 37
  39. 86
  40. 36

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