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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 102 · 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. 2.1 + ? = 10
  3. 3.19 + ? = 100
  4. 4.58 + ? = 100
  5. 5.20 + ? = 100
  6. 6.5 + ? = 10
  7. 7.31 + ? = 100
  8. 8.85 + ? = 100
  9. 9.6 + ? = 10
  10. 10.14 + ? = 100
  11. 11.16 + ? = 100
  12. 12.83 + ? = 100
  13. 13.62 + ? = 100
  14. 14.22 + ? = 100
  15. 15.8 + ? = 10
  16. 16.3 + ? = 10
  17. 17.32 + ? = 100
  18. 18.9 + ? = 10
  19. 19.84 + ? = 100
  20. 20.41 + ? = 100
  21. 21.89 + ? = 100
  22. 22.37 + ? = 100
  23. 23.60 + ? = 100
  24. 24.67 + ? = 100
  25. 25.17 + ? = 100
  26. 26.61 + ? = 100
  27. 27.4 + ? = 10
  28. 28.88 + ? = 100
  29. 29.7 + ? = 10
  30. 30.25 + ? = 100
  31. 31.11 + ? = 100
  32. 32.74 + ? = 100
  33. 33.73 + ? = 100
  34. 34.77 + ? = 100
  35. 35.49 + ? = 100
  36. 36.21 + ? = 100
  37. 37.18 + ? = 100
  38. 38.70 + ? = 100
  39. 39.23 + ? = 100
  40. 40.33 + ? = 100

Answer key

  1. 8
  2. 9
  3. 81
  4. 42
  5. 80
  6. 5
  7. 69
  8. 15
  9. 4
  10. 86
  11. 84
  12. 17
  13. 38
  14. 78
  15. 2
  16. 7
  17. 68
  18. 1
  19. 16
  20. 59
  21. 11
  22. 63
  23. 40
  24. 33
  25. 83
  26. 39
  27. 6
  28. 12
  29. 3
  30. 75
  31. 89
  32. 26
  33. 27
  34. 23
  35. 51
  36. 79
  37. 82
  38. 30
  39. 77
  40. 67

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