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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 55 · 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. 1.75 + ? = 100
  2. 2.2 + ? = 10
  3. 3.1 + ? = 10
  4. 4.65 + ? = 100
  5. 5.5 + ? = 10
  6. 6.32 + ? = 100
  7. 7.19 + ? = 100
  8. 8.8 + ? = 10
  9. 9.20 + ? = 100
  10. 10.84 + ? = 100
  11. 11.49 + ? = 100
  12. 12.63 + ? = 100
  13. 13.35 + ? = 100
  14. 14.39 + ? = 100
  15. 15.44 + ? = 100
  16. 16.67 + ? = 100
  17. 17.11 + ? = 100
  18. 18.83 + ? = 100
  19. 19.78 + ? = 100
  20. 20.6 + ? = 10
  21. 21.3 + ? = 10
  22. 22.64 + ? = 100
  23. 23.14 + ? = 100
  24. 24.74 + ? = 100
  25. 25.56 + ? = 100
  26. 26.61 + ? = 100
  27. 27.25 + ? = 100
  28. 28.4 + ? = 10
  29. 29.87 + ? = 100
  30. 30.7 + ? = 10
  31. 31.22 + ? = 100
  32. 32.69 + ? = 100
  33. 33.23 + ? = 100
  34. 34.9 + ? = 10
  35. 35.20 + ? = 100
  36. 36.46 + ? = 100
  37. 37.72 + ? = 100
  38. 38.66 + ? = 100
  39. 39.26 + ? = 100
  40. 40.70 + ? = 100

Answer key

  1. 25
  2. 8
  3. 9
  4. 35
  5. 5
  6. 68
  7. 81
  8. 2
  9. 80
  10. 16
  11. 51
  12. 37
  13. 65
  14. 61
  15. 56
  16. 33
  17. 89
  18. 17
  19. 22
  20. 4
  21. 7
  22. 36
  23. 86
  24. 26
  25. 44
  26. 39
  27. 75
  28. 6
  29. 13
  30. 3
  31. 78
  32. 31
  33. 77
  34. 1
  35. 80
  36. 54
  37. 28
  38. 34
  39. 74
  40. 30

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