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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 144 · 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. 1.33 + ? = 100
  2. 2.1 + ? = 10
  3. 3.9 + ? = 10
  4. 4.3 + ? = 10
  5. 5.43 + ? = 100
  6. 6.8 + ? = 10
  7. 7.65 + ? = 100
  8. 8.13 + ? = 100
  9. 9.6 + ? = 10
  10. 10.28 + ? = 100
  11. 11.86 + ? = 100
  12. 12.42 + ? = 100
  13. 13.84 + ? = 100
  14. 14.73 + ? = 100
  15. 15.5 + ? = 10
  16. 16.75 + ? = 100
  17. 17.55 + ? = 100
  18. 18.7 + ? = 10
  19. 19.54 + ? = 100
  20. 20.46 + ? = 100
  21. 21.70 + ? = 100
  22. 22.26 + ? = 100
  23. 23.78 + ? = 100
  24. 24.56 + ? = 100
  25. 25.25 + ? = 100
  26. 26.30 + ? = 100
  27. 27.4 + ? = 10
  28. 28.2 + ? = 10
  29. 29.17 + ? = 100
  30. 30.72 + ? = 100
  31. 31.57 + ? = 100
  32. 32.20 + ? = 100
  33. 33.24 + ? = 100
  34. 34.53 + ? = 100
  35. 35.40 + ? = 100
  36. 36.49 + ? = 100
  37. 37.88 + ? = 100
  38. 38.34 + ? = 100
  39. 39.80 + ? = 100
  40. 40.66 + ? = 100

Answer key

  1. 67
  2. 9
  3. 1
  4. 7
  5. 57
  6. 2
  7. 35
  8. 87
  9. 4
  10. 72
  11. 14
  12. 58
  13. 16
  14. 27
  15. 5
  16. 25
  17. 45
  18. 3
  19. 46
  20. 54
  21. 30
  22. 74
  23. 22
  24. 44
  25. 75
  26. 70
  27. 6
  28. 8
  29. 83
  30. 28
  31. 43
  32. 80
  33. 76
  34. 47
  35. 60
  36. 51
  37. 12
  38. 66
  39. 20
  40. 34

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