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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 342 · 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. 1.70 + ? = 100
  2. 2.89 + ? = 100
  3. 3.66 + ? = 100
  4. 4.27 + ? = 100
  5. 5.4 + ? = 10
  6. 6.21 + ? = 100
  7. 7.22 + ? = 100
  8. 8.31 + ? = 100
  9. 9.3 + ? = 10
  10. 10.5 + ? = 10
  11. 11.76 + ? = 100
  12. 12.43 + ? = 100
  13. 13.2 + ? = 10
  14. 14.8 + ? = 10
  15. 15.39 + ? = 100
  16. 16.32 + ? = 100
  17. 17.83 + ? = 100
  18. 18.6 + ? = 10
  19. 19.49 + ? = 100
  20. 20.9 + ? = 10
  21. 21.24 + ? = 100
  22. 22.73 + ? = 100
  23. 23.34 + ? = 100
  24. 24.50 + ? = 100
  25. 25.85 + ? = 100
  26. 26.18 + ? = 100
  27. 27.30 + ? = 100
  28. 28.12 + ? = 100
  29. 29.56 + ? = 100
  30. 30.19 + ? = 100
  31. 31.1 + ? = 10
  32. 32.40 + ? = 100
  33. 33.44 + ? = 100
  34. 34.23 + ? = 100
  35. 35.26 + ? = 100
  36. 36.69 + ? = 100
  37. 37.65 + ? = 100
  38. 38.15 + ? = 100
  39. 39.74 + ? = 100
  40. 40.29 + ? = 100

Answer key

  1. 30
  2. 11
  3. 34
  4. 73
  5. 6
  6. 79
  7. 78
  8. 69
  9. 7
  10. 5
  11. 24
  12. 57
  13. 8
  14. 2
  15. 61
  16. 68
  17. 17
  18. 4
  19. 51
  20. 1
  21. 76
  22. 27
  23. 66
  24. 50
  25. 15
  26. 82
  27. 70
  28. 88
  29. 44
  30. 81
  31. 9
  32. 60
  33. 56
  34. 77
  35. 74
  36. 31
  37. 35
  38. 85
  39. 26
  40. 71

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