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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 393 · 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. 1.12 + ? = 100
  2. 2.3 + ? = 10
  3. 3.22 + ? = 100
  4. 4.7 + ? = 10
  5. 5.6 + ? = 10
  6. 6.4 + ? = 10
  7. 7.26 + ? = 100
  8. 8.64 + ? = 100
  9. 9.20 + ? = 100
  10. 10.21 + ? = 100
  11. 11.31 + ? = 100
  12. 12.81 + ? = 100
  13. 13.60 + ? = 100
  14. 14.51 + ? = 100
  15. 15.13 + ? = 100
  16. 16.5 + ? = 10
  17. 17.34 + ? = 100
  18. 18.53 + ? = 100
  19. 19.9 + ? = 10
  20. 20.80 + ? = 100
  21. 21.48 + ? = 100
  22. 22.71 + ? = 100
  23. 23.2 + ? = 10
  24. 24.45 + ? = 100
  25. 25.27 + ? = 100
  26. 26.1 + ? = 10
  27. 27.49 + ? = 100
  28. 28.14 + ? = 100
  29. 29.65 + ? = 100
  30. 30.17 + ? = 100
  31. 31.8 + ? = 10
  32. 32.30 + ? = 100
  33. 33.75 + ? = 100
  34. 34.42 + ? = 100
  35. 35.54 + ? = 100
  36. 36.33 + ? = 100
  37. 37.89 + ? = 100
  38. 38.70 + ? = 100
  39. 39.73 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 88
  2. 7
  3. 78
  4. 3
  5. 4
  6. 6
  7. 74
  8. 36
  9. 80
  10. 79
  11. 69
  12. 19
  13. 40
  14. 49
  15. 87
  16. 5
  17. 66
  18. 47
  19. 1
  20. 20
  21. 52
  22. 29
  23. 8
  24. 55
  25. 73
  26. 9
  27. 51
  28. 86
  29. 35
  30. 83
  31. 2
  32. 70
  33. 25
  34. 58
  35. 46
  36. 67
  37. 11
  38. 30
  39. 27
  40. 56

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