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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 478 · 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. 1.1 + ? = 10
  2. 2.9 + ? = 10
  3. 3.8 + ? = 10
  4. 4.7 + ? = 10
  5. 5.15 + ? = 100
  6. 6.2 + ? = 10
  7. 7.6 + ? = 10
  8. 8.11 + ? = 100
  9. 9.4 + ? = 10
  10. 10.85 + ? = 100
  11. 11.17 + ? = 100
  12. 12.22 + ? = 100
  13. 13.44 + ? = 100
  14. 14.65 + ? = 100
  15. 15.73 + ? = 100
  16. 16.41 + ? = 100
  17. 17.3 + ? = 10
  18. 18.5 + ? = 10
  19. 19.31 + ? = 100
  20. 20.18 + ? = 100
  21. 21.81 + ? = 100
  22. 22.24 + ? = 100
  23. 23.28 + ? = 100
  24. 24.20 + ? = 100
  25. 25.57 + ? = 100
  26. 26.35 + ? = 100
  27. 27.48 + ? = 100
  28. 28.51 + ? = 100
  29. 29.37 + ? = 100
  30. 30.23 + ? = 100
  31. 31.32 + ? = 100
  32. 32.53 + ? = 100
  33. 33.78 + ? = 100
  34. 34.13 + ? = 100
  35. 35.33 + ? = 100
  36. 36.80 + ? = 100
  37. 37.34 + ? = 100
  38. 38.16 + ? = 100
  39. 39.54 + ? = 100
  40. 40.84 + ? = 100

Answer key

  1. 9
  2. 1
  3. 2
  4. 3
  5. 85
  6. 8
  7. 4
  8. 89
  9. 6
  10. 15
  11. 83
  12. 78
  13. 56
  14. 35
  15. 27
  16. 59
  17. 7
  18. 5
  19. 69
  20. 82
  21. 19
  22. 76
  23. 72
  24. 80
  25. 43
  26. 65
  27. 52
  28. 49
  29. 63
  30. 77
  31. 68
  32. 47
  33. 22
  34. 87
  35. 67
  36. 20
  37. 66
  38. 84
  39. 46
  40. 16

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