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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 365 · 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. 2.6 + ? = 10
  3. 3.4 + ? = 10
  4. 4.22 + ? = 100
  5. 5.41 + ? = 100
  6. 6.64 + ? = 100
  7. 7.49 + ? = 100
  8. 8.52 + ? = 100
  9. 9.51 + ? = 100
  10. 10.3 + ? = 10
  11. 11.82 + ? = 100
  12. 12.35 + ? = 100
  13. 13.37 + ? = 100
  14. 14.7 + ? = 10
  15. 15.2 + ? = 10
  16. 16.44 + ? = 100
  17. 17.71 + ? = 100
  18. 18.29 + ? = 100
  19. 19.11 + ? = 100
  20. 20.84 + ? = 100
  21. 21.85 + ? = 100
  22. 22.43 + ? = 100
  23. 23.1 + ? = 10
  24. 24.27 + ? = 100
  25. 25.32 + ? = 100
  26. 26.5 + ? = 10
  27. 27.33 + ? = 100
  28. 28.16 + ? = 100
  29. 29.65 + ? = 100
  30. 30.8 + ? = 10
  31. 31.69 + ? = 100
  32. 32.72 + ? = 100
  33. 33.87 + ? = 100
  34. 34.74 + ? = 100
  35. 35.62 + ? = 100
  36. 36.36 + ? = 100
  37. 37.31 + ? = 100
  38. 38.39 + ? = 100
  39. 39.19 + ? = 100
  40. 40.23 + ? = 100

Answer key

  1. 1
  2. 4
  3. 6
  4. 78
  5. 59
  6. 36
  7. 51
  8. 48
  9. 49
  10. 7
  11. 18
  12. 65
  13. 63
  14. 3
  15. 8
  16. 56
  17. 29
  18. 71
  19. 89
  20. 16
  21. 15
  22. 57
  23. 9
  24. 73
  25. 68
  26. 5
  27. 67
  28. 84
  29. 35
  30. 2
  31. 31
  32. 28
  33. 13
  34. 26
  35. 38
  36. 64
  37. 69
  38. 61
  39. 81
  40. 77

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