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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 42 · 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. 1.1 + ? = 10
  2. 2.6 + ? = 10
  3. 3.31 + ? = 100
  4. 4.74 + ? = 100
  5. 5.43 + ? = 100
  6. 6.3 + ? = 10
  7. 7.15 + ? = 100
  8. 8.8 + ? = 10
  9. 9.78 + ? = 100
  10. 10.50 + ? = 100
  11. 11.37 + ? = 100
  12. 12.14 + ? = 100
  13. 13.5 + ? = 10
  14. 14.9 + ? = 10
  15. 15.59 + ? = 100
  16. 16.22 + ? = 100
  17. 17.2 + ? = 10
  18. 18.4 + ? = 10
  19. 19.16 + ? = 100
  20. 20.80 + ? = 100
  21. 21.12 + ? = 100
  22. 22.86 + ? = 100
  23. 23.53 + ? = 100
  24. 24.82 + ? = 100
  25. 25.51 + ? = 100
  26. 26.64 + ? = 100
  27. 27.7 + ? = 10
  28. 28.79 + ? = 100
  29. 29.36 + ? = 100
  30. 30.73 + ? = 100
  31. 31.24 + ? = 100
  32. 32.34 + ? = 100
  33. 33.61 + ? = 100
  34. 34.81 + ? = 100
  35. 35.75 + ? = 100
  36. 36.21 + ? = 100
  37. 37.55 + ? = 100
  38. 38.57 + ? = 100
  39. 39.84 + ? = 100
  40. 40.89 + ? = 100

Answer key

  1. 9
  2. 4
  3. 69
  4. 26
  5. 57
  6. 7
  7. 85
  8. 2
  9. 22
  10. 50
  11. 63
  12. 86
  13. 5
  14. 1
  15. 41
  16. 78
  17. 8
  18. 6
  19. 84
  20. 20
  21. 88
  22. 14
  23. 47
  24. 18
  25. 49
  26. 36
  27. 3
  28. 21
  29. 64
  30. 27
  31. 76
  32. 66
  33. 39
  34. 19
  35. 25
  36. 79
  37. 45
  38. 43
  39. 16
  40. 11

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