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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 507 · 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. 1.58 + ? = 100
  2. 2.3 + ? = 10
  3. 3.7 + ? = 10
  4. 4.44 + ? = 100
  5. 5.65 + ? = 100
  6. 6.86 + ? = 100
  7. 7.71 + ? = 100
  8. 8.79 + ? = 100
  9. 9.6 + ? = 10
  10. 10.16 + ? = 100
  11. 11.2 + ? = 10
  12. 12.8 + ? = 10
  13. 13.5 + ? = 10
  14. 14.40 + ? = 100
  15. 15.12 + ? = 100
  16. 16.4 + ? = 10
  17. 17.73 + ? = 100
  18. 18.20 + ? = 100
  19. 19.22 + ? = 100
  20. 20.1 + ? = 10
  21. 21.38 + ? = 100
  22. 22.72 + ? = 100
  23. 23.30 + ? = 100
  24. 24.32 + ? = 100
  25. 25.70 + ? = 100
  26. 26.67 + ? = 100
  27. 27.78 + ? = 100
  28. 28.42 + ? = 100
  29. 29.23 + ? = 100
  30. 30.9 + ? = 10
  31. 31.24 + ? = 100
  32. 32.47 + ? = 100
  33. 33.46 + ? = 100
  34. 34.19 + ? = 100
  35. 35.59 + ? = 100
  36. 36.31 + ? = 100
  37. 37.82 + ? = 100
  38. 38.61 + ? = 100
  39. 39.21 + ? = 100
  40. 40.45 + ? = 100

Answer key

  1. 42
  2. 7
  3. 3
  4. 56
  5. 35
  6. 14
  7. 29
  8. 21
  9. 4
  10. 84
  11. 8
  12. 2
  13. 5
  14. 60
  15. 88
  16. 6
  17. 27
  18. 80
  19. 78
  20. 9
  21. 62
  22. 28
  23. 70
  24. 68
  25. 30
  26. 33
  27. 22
  28. 58
  29. 77
  30. 1
  31. 76
  32. 53
  33. 54
  34. 81
  35. 41
  36. 69
  37. 18
  38. 39
  39. 79
  40. 55

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