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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 49 · 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. 1.68 + ? = 100
  2. 2.14 + ? = 100
  3. 3.23 + ? = 100
  4. 4.3 + ? = 10
  5. 5.49 + ? = 100
  6. 6.20 + ? = 100
  7. 7.60 + ? = 100
  8. 8.8 + ? = 10
  9. 9.65 + ? = 100
  10. 10.9 + ? = 10
  11. 11.50 + ? = 100
  12. 12.71 + ? = 100
  13. 13.75 + ? = 100
  14. 14.28 + ? = 100
  15. 15.1 + ? = 10
  16. 16.43 + ? = 100
  17. 17.7 + ? = 10
  18. 18.2 + ? = 10
  19. 19.33 + ? = 100
  20. 20.56 + ? = 100
  21. 21.24 + ? = 100
  22. 22.6 + ? = 10
  23. 23.88 + ? = 100
  24. 24.18 + ? = 100
  25. 25.30 + ? = 100
  26. 26.4 + ? = 10
  27. 27.82 + ? = 100
  28. 28.76 + ? = 100
  29. 29.55 + ? = 100
  30. 30.27 + ? = 100
  31. 31.15 + ? = 100
  32. 32.12 + ? = 100
  33. 33.84 + ? = 100
  34. 34.79 + ? = 100
  35. 35.70 + ? = 100
  36. 36.58 + ? = 100
  37. 37.5 + ? = 10
  38. 38.54 + ? = 100
  39. 39.81 + ? = 100
  40. 40.29 + ? = 100

Answer key

  1. 32
  2. 86
  3. 77
  4. 7
  5. 51
  6. 80
  7. 40
  8. 2
  9. 35
  10. 1
  11. 50
  12. 29
  13. 25
  14. 72
  15. 9
  16. 57
  17. 3
  18. 8
  19. 67
  20. 44
  21. 76
  22. 4
  23. 12
  24. 82
  25. 70
  26. 6
  27. 18
  28. 24
  29. 45
  30. 73
  31. 85
  32. 88
  33. 16
  34. 21
  35. 30
  36. 42
  37. 5
  38. 46
  39. 19
  40. 71

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