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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 283 · 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. 1.59 + ? = 100
  2. 2.3 + ? = 10
  3. 3.71 + ? = 100
  4. 4.42 + ? = 100
  5. 5.21 + ? = 100
  6. 6.74 + ? = 100
  7. 7.75 + ? = 100
  8. 8.5 + ? = 10
  9. 9.34 + ? = 100
  10. 10.65 + ? = 100
  11. 11.82 + ? = 100
  12. 12.7 + ? = 10
  13. 13.41 + ? = 100
  14. 14.14 + ? = 100
  15. 15.20 + ? = 100
  16. 16.8 + ? = 10
  17. 17.2 + ? = 10
  18. 18.9 + ? = 10
  19. 19.1 + ? = 10
  20. 20.27 + ? = 100
  21. 21.18 + ? = 100
  22. 22.60 + ? = 100
  23. 23.79 + ? = 100
  24. 24.83 + ? = 100
  25. 25.64 + ? = 100
  26. 26.4 + ? = 10
  27. 27.35 + ? = 100
  28. 28.24 + ? = 100
  29. 29.73 + ? = 100
  30. 30.30 + ? = 100
  31. 31.62 + ? = 100
  32. 32.23 + ? = 100
  33. 33.6 + ? = 10
  34. 34.29 + ? = 100
  35. 35.36 + ? = 100
  36. 36.87 + ? = 100
  37. 37.68 + ? = 100
  38. 38.37 + ? = 100
  39. 39.55 + ? = 100
  40. 40.12 + ? = 100

Answer key

  1. 41
  2. 7
  3. 29
  4. 58
  5. 79
  6. 26
  7. 25
  8. 5
  9. 66
  10. 35
  11. 18
  12. 3
  13. 59
  14. 86
  15. 80
  16. 2
  17. 8
  18. 1
  19. 9
  20. 73
  21. 82
  22. 40
  23. 21
  24. 17
  25. 36
  26. 6
  27. 65
  28. 76
  29. 27
  30. 70
  31. 38
  32. 77
  33. 4
  34. 71
  35. 64
  36. 13
  37. 32
  38. 63
  39. 45
  40. 88

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