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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 443 · 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. 1.5 + ? = 10
  2. 2.33 + ? = 100
  3. 3.55 + ? = 100
  4. 4.48 + ? = 100
  5. 5.71 + ? = 100
  6. 6.85 + ? = 100
  7. 7.59 + ? = 100
  8. 8.7 + ? = 10
  9. 9.38 + ? = 100
  10. 10.3 + ? = 10
  11. 11.34 + ? = 100
  12. 12.89 + ? = 100
  13. 13.36 + ? = 100
  14. 14.1 + ? = 10
  15. 15.37 + ? = 100
  16. 16.17 + ? = 100
  17. 17.13 + ? = 100
  18. 18.43 + ? = 100
  19. 19.12 + ? = 100
  20. 20.66 + ? = 100
  21. 21.62 + ? = 100
  22. 22.30 + ? = 100
  23. 23.76 + ? = 100
  24. 24.4 + ? = 10
  25. 25.88 + ? = 100
  26. 26.21 + ? = 100
  27. 27.81 + ? = 100
  28. 28.61 + ? = 100
  29. 29.49 + ? = 100
  30. 30.69 + ? = 100
  31. 31.9 + ? = 10
  32. 32.2 + ? = 10
  33. 33.51 + ? = 100
  34. 34.8 + ? = 10
  35. 35.35 + ? = 100
  36. 36.29 + ? = 100
  37. 37.20 + ? = 100
  38. 38.77 + ? = 100
  39. 39.6 + ? = 10
  40. 40.72 + ? = 100

Answer key

  1. 5
  2. 67
  3. 45
  4. 52
  5. 29
  6. 15
  7. 41
  8. 3
  9. 62
  10. 7
  11. 66
  12. 11
  13. 64
  14. 9
  15. 63
  16. 83
  17. 87
  18. 57
  19. 88
  20. 34
  21. 38
  22. 70
  23. 24
  24. 6
  25. 12
  26. 79
  27. 19
  28. 39
  29. 51
  30. 31
  31. 1
  32. 8
  33. 49
  34. 2
  35. 65
  36. 71
  37. 80
  38. 23
  39. 4
  40. 28

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