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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 78 · 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. 1.7 + ? = 10
  2. 2.78 + ? = 100
  3. 3.8 + ? = 10
  4. 4.5 + ? = 10
  5. 5.13 + ? = 100
  6. 6.42 + ? = 100
  7. 7.2 + ? = 10
  8. 8.27 + ? = 100
  9. 9.56 + ? = 100
  10. 10.3 + ? = 10
  11. 11.34 + ? = 100
  12. 12.65 + ? = 100
  13. 13.4 + ? = 10
  14. 14.9 + ? = 10
  15. 15.1 + ? = 10
  16. 16.18 + ? = 100
  17. 17.39 + ? = 100
  18. 18.21 + ? = 100
  19. 19.6 + ? = 10
  20. 20.44 + ? = 100
  21. 21.25 + ? = 100
  22. 22.66 + ? = 100
  23. 23.54 + ? = 100
  24. 24.69 + ? = 100
  25. 25.30 + ? = 100
  26. 26.31 + ? = 100
  27. 27.38 + ? = 100
  28. 28.60 + ? = 100
  29. 29.61 + ? = 100
  30. 30.70 + ? = 100
  31. 31.82 + ? = 100
  32. 32.32 + ? = 100
  33. 33.85 + ? = 100
  34. 34.15 + ? = 100
  35. 35.24 + ? = 100
  36. 36.50 + ? = 100
  37. 37.67 + ? = 100
  38. 38.76 + ? = 100
  39. 39.45 + ? = 100
  40. 40.83 + ? = 100

Answer key

  1. 3
  2. 22
  3. 2
  4. 5
  5. 87
  6. 58
  7. 8
  8. 73
  9. 44
  10. 7
  11. 66
  12. 35
  13. 6
  14. 1
  15. 9
  16. 82
  17. 61
  18. 79
  19. 4
  20. 56
  21. 75
  22. 34
  23. 46
  24. 31
  25. 70
  26. 69
  27. 62
  28. 40
  29. 39
  30. 30
  31. 18
  32. 68
  33. 15
  34. 85
  35. 76
  36. 50
  37. 33
  38. 24
  39. 55
  40. 17

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