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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 5 · 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. 1.2 + ? = 10
  2. 2.76 + ? = 100
  3. 3.55 + ? = 100
  4. 4.79 + ? = 100
  5. 5.46 + ? = 100
  6. 6.61 + ? = 100
  7. 7.7 + ? = 10
  8. 8.6 + ? = 10
  9. 9.9 + ? = 10
  10. 10.17 + ? = 100
  11. 11.36 + ? = 100
  12. 12.68 + ? = 100
  13. 13.23 + ? = 100
  14. 14.33 + ? = 100
  15. 15.38 + ? = 100
  16. 16.41 + ? = 100
  17. 17.56 + ? = 100
  18. 18.3 + ? = 10
  19. 19.44 + ? = 100
  20. 20.77 + ? = 100
  21. 21.83 + ? = 100
  22. 22.35 + ? = 100
  23. 23.5 + ? = 10
  24. 24.84 + ? = 100
  25. 25.19 + ? = 100
  26. 26.13 + ? = 100
  27. 27.85 + ? = 100
  28. 28.70 + ? = 100
  29. 29.86 + ? = 100
  30. 30.20 + ? = 100
  31. 31.67 + ? = 100
  32. 32.43 + ? = 100
  33. 33.72 + ? = 100
  34. 34.4 + ? = 10
  35. 35.60 + ? = 100
  36. 36.25 + ? = 100
  37. 37.8 + ? = 10
  38. 38.75 + ? = 100
  39. 39.21 + ? = 100
  40. 40.80 + ? = 100

Answer key

  1. 8
  2. 24
  3. 45
  4. 21
  5. 54
  6. 39
  7. 3
  8. 4
  9. 1
  10. 83
  11. 64
  12. 32
  13. 77
  14. 67
  15. 62
  16. 59
  17. 44
  18. 7
  19. 56
  20. 23
  21. 17
  22. 65
  23. 5
  24. 16
  25. 81
  26. 87
  27. 15
  28. 30
  29. 14
  30. 80
  31. 33
  32. 57
  33. 28
  34. 6
  35. 40
  36. 75
  37. 2
  38. 25
  39. 79
  40. 20

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