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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 261 · 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. 1.9 + ? = 10
  2. 2.87 + ? = 100
  3. 3.70 + ? = 100
  4. 4.1 + ? = 10
  5. 5.75 + ? = 100
  6. 6.7 + ? = 10
  7. 7.3 + ? = 10
  8. 8.6 + ? = 10
  9. 9.16 + ? = 100
  10. 10.36 + ? = 100
  11. 11.57 + ? = 100
  12. 12.25 + ? = 100
  13. 13.2 + ? = 10
  14. 14.79 + ? = 100
  15. 15.42 + ? = 100
  16. 16.82 + ? = 100
  17. 17.44 + ? = 100
  18. 18.23 + ? = 100
  19. 19.8 + ? = 10
  20. 20.45 + ? = 100
  21. 21.27 + ? = 100
  22. 22.84 + ? = 100
  23. 23.22 + ? = 100
  24. 24.4 + ? = 10
  25. 25.35 + ? = 100
  26. 26.69 + ? = 100
  27. 27.5 + ? = 10
  28. 28.47 + ? = 100
  29. 29.89 + ? = 100
  30. 30.46 + ? = 100
  31. 31.64 + ? = 100
  32. 32.49 + ? = 100
  33. 33.77 + ? = 100
  34. 34.14 + ? = 100
  35. 35.24 + ? = 100
  36. 36.51 + ? = 100
  37. 37.37 + ? = 100
  38. 38.20 + ? = 100
  39. 39.88 + ? = 100
  40. 40.60 + ? = 100

Answer key

  1. 1
  2. 13
  3. 30
  4. 9
  5. 25
  6. 3
  7. 7
  8. 4
  9. 84
  10. 64
  11. 43
  12. 75
  13. 8
  14. 21
  15. 58
  16. 18
  17. 56
  18. 77
  19. 2
  20. 55
  21. 73
  22. 16
  23. 78
  24. 6
  25. 65
  26. 31
  27. 5
  28. 53
  29. 11
  30. 54
  31. 36
  32. 51
  33. 23
  34. 86
  35. 76
  36. 49
  37. 63
  38. 80
  39. 12
  40. 40

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