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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 970 · 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. 1.20 + ? = 100
  2. 2.53 + ? = 100
  3. 3.66 + ? = 100
  4. 4.16 + ? = 100
  5. 5.14 + ? = 100
  6. 6.79 + ? = 100
  7. 7.7 + ? = 10
  8. 8.71 + ? = 100
  9. 9.82 + ? = 100
  10. 10.8 + ? = 10
  11. 11.25 + ? = 100
  12. 12.77 + ? = 100
  13. 13.1 + ? = 10
  14. 14.75 + ? = 100
  15. 15.59 + ? = 100
  16. 16.4 + ? = 10
  17. 17.24 + ? = 100
  18. 18.41 + ? = 100
  19. 19.30 + ? = 100
  20. 20.12 + ? = 100
  21. 21.48 + ? = 100
  22. 22.45 + ? = 100
  23. 23.6 + ? = 10
  24. 24.74 + ? = 100
  25. 25.44 + ? = 100
  26. 26.9 + ? = 10
  27. 27.2 + ? = 10
  28. 28.3 + ? = 10
  29. 29.56 + ? = 100
  30. 30.27 + ? = 100
  31. 31.32 + ? = 100
  32. 32.5 + ? = 10
  33. 33.21 + ? = 100
  34. 34.43 + ? = 100
  35. 35.81 + ? = 100
  36. 36.62 + ? = 100
  37. 37.64 + ? = 100
  38. 38.35 + ? = 100
  39. 39.80 + ? = 100
  40. 40.37 + ? = 100

Answer key

  1. 80
  2. 47
  3. 34
  4. 84
  5. 86
  6. 21
  7. 3
  8. 29
  9. 18
  10. 2
  11. 75
  12. 23
  13. 9
  14. 25
  15. 41
  16. 6
  17. 76
  18. 59
  19. 70
  20. 88
  21. 52
  22. 55
  23. 4
  24. 26
  25. 56
  26. 1
  27. 8
  28. 7
  29. 44
  30. 73
  31. 68
  32. 5
  33. 79
  34. 57
  35. 19
  36. 38
  37. 36
  38. 65
  39. 20
  40. 63

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