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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 82 · 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. 1.5 + ? = 10
  2. 2.3 + ? = 10
  3. 3.2 + ? = 10
  4. 4.40 + ? = 100
  5. 5.59 + ? = 100
  6. 6.6 + ? = 10
  7. 7.75 + ? = 100
  8. 8.73 + ? = 100
  9. 9.4 + ? = 10
  10. 10.60 + ? = 100
  11. 11.49 + ? = 100
  12. 12.1 + ? = 10
  13. 13.53 + ? = 100
  14. 14.9 + ? = 10
  15. 15.46 + ? = 100
  16. 16.34 + ? = 100
  17. 17.68 + ? = 100
  18. 18.50 + ? = 100
  19. 19.28 + ? = 100
  20. 20.87 + ? = 100
  21. 21.38 + ? = 100
  22. 22.16 + ? = 100
  23. 23.41 + ? = 100
  24. 24.7 + ? = 10
  25. 25.43 + ? = 100
  26. 26.8 + ? = 10
  27. 27.48 + ? = 100
  28. 28.47 + ? = 100
  29. 29.58 + ? = 100
  30. 30.23 + ? = 100
  31. 31.21 + ? = 100
  32. 32.25 + ? = 100
  33. 33.30 + ? = 100
  34. 34.22 + ? = 100
  35. 35.63 + ? = 100
  36. 36.11 + ? = 100
  37. 37.54 + ? = 100
  38. 38.35 + ? = 100
  39. 39.66 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 5
  2. 7
  3. 8
  4. 60
  5. 41
  6. 4
  7. 25
  8. 27
  9. 6
  10. 40
  11. 51
  12. 9
  13. 47
  14. 1
  15. 54
  16. 66
  17. 32
  18. 50
  19. 72
  20. 13
  21. 62
  22. 84
  23. 59
  24. 3
  25. 57
  26. 2
  27. 52
  28. 53
  29. 42
  30. 77
  31. 79
  32. 75
  33. 70
  34. 78
  35. 37
  36. 89
  37. 46
  38. 65
  39. 34
  40. 81

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