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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 54 · 40 questions
TalentJR

The trick (Split and double): Split the number into tens and ones: 37 = 30 + 7. Double each part (30 → 60, 7 → 14) — or halve each part. Add the two answers: 60 + 14 = 74.

NameDateTime takenScore ___ / 40
  1. 1.Double 85 =
  2. 2.Double 15 =
  3. 3.Half of 162 =
  4. 4.Double 66 =
  5. 5.Double 12 =
  6. 6.Double 41 =
  7. 7.Double 11 =
  8. 8.Half of 142 =
  9. 9.Double 37 =
  10. 10.Double 73 =
  11. 11.Half of 72 =
  12. 12.Half of 156 =
  13. 13.Half of 194 =
  14. 14.Double 82 =
  15. 15.Double 54 =
  16. 16.Double 36 =
  17. 17.Half of 178 =
  18. 18.Half of 14 =
  19. 19.Half of 12 =
  20. 20.Half of 128 =
  21. 21.Half of 66 =
  22. 22.Half of 176 =
  23. 23.Half of 122 =
  24. 24.Half of 64 =
  25. 25.Half of 108 =
  26. 26.Double 67 =
  27. 27.Half of 96 =
  28. 28.Double 71 =
  29. 29.Half of 22 =
  30. 30.Half of 42 =
  31. 31.Half of 34 =
  32. 32.Double 22 =
  33. 33.Half of 48 =
  34. 34.Double 63 =
  35. 35.Double 99 =
  36. 36.Half of 68 =
  37. 37.Half of 134 =
  38. 38.Double 32 =
  39. 39.Half of 32 =
  40. 40.Double 89 =

Answer key

  1. 170
  2. 30
  3. 81
  4. 132
  5. 24
  6. 82
  7. 22
  8. 71
  9. 74
  10. 146
  11. 36
  12. 78
  13. 97
  14. 164
  15. 108
  16. 72
  17. 89
  18. 7
  19. 6
  20. 64
  21. 33
  22. 88
  23. 61
  24. 32
  25. 54
  26. 134
  27. 48
  28. 142
  29. 11
  30. 21
  31. 17
  32. 44
  33. 24
  34. 126
  35. 198
  36. 34
  37. 67
  38. 64
  39. 16
  40. 178

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