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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 371 · 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. 1.15 + ? = 100
  2. 2.59 + ? = 100
  3. 3.9 + ? = 10
  4. 4.6 + ? = 10
  5. 5.43 + ? = 100
  6. 6.18 + ? = 100
  7. 7.14 + ? = 100
  8. 8.35 + ? = 100
  9. 9.1 + ? = 10
  10. 10.5 + ? = 10
  11. 11.68 + ? = 100
  12. 12.44 + ? = 100
  13. 13.62 + ? = 100
  14. 14.78 + ? = 100
  15. 15.13 + ? = 100
  16. 16.64 + ? = 100
  17. 17.63 + ? = 100
  18. 18.4 + ? = 10
  19. 19.31 + ? = 100
  20. 20.7 + ? = 10
  21. 21.74 + ? = 100
  22. 22.47 + ? = 100
  23. 23.2 + ? = 10
  24. 24.67 + ? = 100
  25. 25.30 + ? = 100
  26. 26.16 + ? = 100
  27. 27.71 + ? = 100
  28. 28.82 + ? = 100
  29. 29.3 + ? = 10
  30. 30.8 + ? = 10
  31. 31.86 + ? = 100
  32. 32.41 + ? = 100
  33. 33.34 + ? = 100
  34. 34.77 + ? = 100
  35. 35.42 + ? = 100
  36. 36.80 + ? = 100
  37. 37.19 + ? = 100
  38. 38.25 + ? = 100
  39. 39.70 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 85
  2. 41
  3. 1
  4. 4
  5. 57
  6. 82
  7. 86
  8. 65
  9. 9
  10. 5
  11. 32
  12. 56
  13. 38
  14. 22
  15. 87
  16. 36
  17. 37
  18. 6
  19. 69
  20. 3
  21. 26
  22. 53
  23. 8
  24. 33
  25. 70
  26. 84
  27. 29
  28. 18
  29. 7
  30. 2
  31. 14
  32. 59
  33. 66
  34. 23
  35. 58
  36. 20
  37. 81
  38. 75
  39. 30
  40. 24

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