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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 273 · 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. 1.45 + ? = 100
  2. 2.14 + ? = 100
  3. 3.26 + ? = 100
  4. 4.58 + ? = 100
  5. 5.20 + ? = 100
  6. 6.50 + ? = 100
  7. 7.1 + ? = 10
  8. 8.4 + ? = 10
  9. 9.48 + ? = 100
  10. 10.7 + ? = 10
  11. 11.53 + ? = 100
  12. 12.9 + ? = 10
  13. 13.71 + ? = 100
  14. 14.15 + ? = 100
  15. 15.81 + ? = 100
  16. 16.75 + ? = 100
  17. 17.2 + ? = 10
  18. 18.22 + ? = 100
  19. 19.54 + ? = 100
  20. 20.17 + ? = 100
  21. 21.3 + ? = 10
  22. 22.67 + ? = 100
  23. 23.5 + ? = 10
  24. 24.84 + ? = 100
  25. 25.6 + ? = 10
  26. 26.13 + ? = 100
  27. 27.25 + ? = 100
  28. 28.63 + ? = 100
  29. 29.79 + ? = 100
  30. 30.41 + ? = 100
  31. 31.40 + ? = 100
  32. 32.87 + ? = 100
  33. 33.18 + ? = 100
  34. 34.59 + ? = 100
  35. 35.16 + ? = 100
  36. 36.8 + ? = 10
  37. 37.37 + ? = 100
  38. 38.47 + ? = 100
  39. 39.85 + ? = 100
  40. 40.57 + ? = 100

Answer key

  1. 55
  2. 86
  3. 74
  4. 42
  5. 80
  6. 50
  7. 9
  8. 6
  9. 52
  10. 3
  11. 47
  12. 1
  13. 29
  14. 85
  15. 19
  16. 25
  17. 8
  18. 78
  19. 46
  20. 83
  21. 7
  22. 33
  23. 5
  24. 16
  25. 4
  26. 87
  27. 75
  28. 37
  29. 21
  30. 59
  31. 60
  32. 13
  33. 82
  34. 41
  35. 84
  36. 2
  37. 63
  38. 53
  39. 15
  40. 43

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