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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 272 · 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. 2.8 + ? = 10
  3. 3.74 + ? = 100
  4. 4.26 + ? = 100
  5. 5.7 + ? = 10
  6. 6.4 + ? = 10
  7. 7.69 + ? = 100
  8. 8.68 + ? = 100
  9. 9.6 + ? = 10
  10. 10.19 + ? = 100
  11. 11.55 + ? = 100
  12. 12.56 + ? = 100
  13. 13.15 + ? = 100
  14. 14.30 + ? = 100
  15. 15.20 + ? = 100
  16. 16.29 + ? = 100
  17. 17.44 + ? = 100
  18. 18.1 + ? = 10
  19. 19.2 + ? = 10
  20. 20.49 + ? = 100
  21. 21.31 + ? = 100
  22. 22.11 + ? = 100
  23. 23.66 + ? = 100
  24. 24.48 + ? = 100
  25. 25.61 + ? = 100
  26. 26.18 + ? = 100
  27. 27.9 + ? = 10
  28. 28.45 + ? = 100
  29. 29.81 + ? = 100
  30. 30.3 + ? = 10
  31. 31.17 + ? = 100
  32. 32.60 + ? = 100
  33. 33.24 + ? = 100
  34. 34.33 + ? = 100
  35. 35.59 + ? = 100
  36. 36.52 + ? = 100
  37. 37.83 + ? = 100
  38. 38.79 + ? = 100
  39. 39.73 + ? = 100
  40. 40.37 + ? = 100

Answer key

  1. 5
  2. 2
  3. 26
  4. 74
  5. 3
  6. 6
  7. 31
  8. 32
  9. 4
  10. 81
  11. 45
  12. 44
  13. 85
  14. 70
  15. 80
  16. 71
  17. 56
  18. 9
  19. 8
  20. 51
  21. 69
  22. 89
  23. 34
  24. 52
  25. 39
  26. 82
  27. 1
  28. 55
  29. 19
  30. 7
  31. 83
  32. 40
  33. 76
  34. 67
  35. 41
  36. 48
  37. 17
  38. 21
  39. 27
  40. 63

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