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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 406 · 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. 1.6 + ? = 10
  2. 2.44 + ? = 100
  3. 3.2 + ? = 10
  4. 4.4 + ? = 10
  5. 5.15 + ? = 100
  6. 6.22 + ? = 100
  7. 7.1 + ? = 10
  8. 8.5 + ? = 10
  9. 9.55 + ? = 100
  10. 10.72 + ? = 100
  11. 11.31 + ? = 100
  12. 12.81 + ? = 100
  13. 13.88 + ? = 100
  14. 14.3 + ? = 10
  15. 15.27 + ? = 100
  16. 16.24 + ? = 100
  17. 17.64 + ? = 100
  18. 18.89 + ? = 100
  19. 19.8 + ? = 10
  20. 20.77 + ? = 100
  21. 21.9 + ? = 10
  22. 22.14 + ? = 100
  23. 23.25 + ? = 100
  24. 24.18 + ? = 100
  25. 25.85 + ? = 100
  26. 26.21 + ? = 100
  27. 27.52 + ? = 100
  28. 28.86 + ? = 100
  29. 29.23 + ? = 100
  30. 30.59 + ? = 100
  31. 31.17 + ? = 100
  32. 32.68 + ? = 100
  33. 33.37 + ? = 100
  34. 34.20 + ? = 100
  35. 35.36 + ? = 100
  36. 36.60 + ? = 100
  37. 37.13 + ? = 100
  38. 38.80 + ? = 100
  39. 39.12 + ? = 100
  40. 40.67 + ? = 100

Answer key

  1. 4
  2. 56
  3. 8
  4. 6
  5. 85
  6. 78
  7. 9
  8. 5
  9. 45
  10. 28
  11. 69
  12. 19
  13. 12
  14. 7
  15. 73
  16. 76
  17. 36
  18. 11
  19. 2
  20. 23
  21. 1
  22. 86
  23. 75
  24. 82
  25. 15
  26. 79
  27. 48
  28. 14
  29. 77
  30. 41
  31. 83
  32. 32
  33. 63
  34. 80
  35. 64
  36. 40
  37. 87
  38. 20
  39. 88
  40. 33

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