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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 166 · 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. 1.33 + ? = 100
  2. 2.45 + ? = 100
  3. 3.6 + ? = 10
  4. 4.7 + ? = 10
  5. 5.1 + ? = 10
  6. 6.41 + ? = 100
  7. 7.15 + ? = 100
  8. 8.11 + ? = 100
  9. 9.3 + ? = 10
  10. 10.44 + ? = 100
  11. 11.17 + ? = 100
  12. 12.83 + ? = 100
  13. 13.59 + ? = 100
  14. 14.2 + ? = 10
  15. 15.67 + ? = 100
  16. 16.30 + ? = 100
  17. 17.4 + ? = 10
  18. 18.24 + ? = 100
  19. 19.8 + ? = 10
  20. 20.69 + ? = 100
  21. 21.46 + ? = 100
  22. 22.52 + ? = 100
  23. 23.73 + ? = 100
  24. 24.12 + ? = 100
  25. 25.86 + ? = 100
  26. 26.19 + ? = 100
  27. 27.40 + ? = 100
  28. 28.64 + ? = 100
  29. 29.56 + ? = 100
  30. 30.58 + ? = 100
  31. 31.9 + ? = 10
  32. 32.27 + ? = 100
  33. 33.50 + ? = 100
  34. 34.85 + ? = 100
  35. 35.5 + ? = 10
  36. 36.75 + ? = 100
  37. 37.78 + ? = 100
  38. 38.13 + ? = 100
  39. 39.72 + ? = 100
  40. 40.18 + ? = 100

Answer key

  1. 67
  2. 55
  3. 4
  4. 3
  5. 9
  6. 59
  7. 85
  8. 89
  9. 7
  10. 56
  11. 83
  12. 17
  13. 41
  14. 8
  15. 33
  16. 70
  17. 6
  18. 76
  19. 2
  20. 31
  21. 54
  22. 48
  23. 27
  24. 88
  25. 14
  26. 81
  27. 60
  28. 36
  29. 44
  30. 42
  31. 1
  32. 73
  33. 50
  34. 15
  35. 5
  36. 25
  37. 22
  38. 87
  39. 28
  40. 82

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