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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 250 · 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 81 =
  2. 2.Half of 42 =
  3. 3.Double 69 =
  4. 4.Double 32 =
  5. 5.Half of 152 =
  6. 6.Double 51 =
  7. 7.Double 83 =
  8. 8.Half of 12 =
  9. 9.Half of 102 =
  10. 10.Half of 196 =
  11. 11.Double 45 =
  12. 12.Double 87 =
  13. 13.Double 76 =
  14. 14.Half of 74 =
  15. 15.Double 38 =
  16. 16.Half of 166 =
  17. 17.Double 96 =
  18. 18.Double 26 =
  19. 19.Half of 82 =
  20. 20.Half of 178 =
  21. 21.Half of 16 =
  22. 22.Half of 142 =
  23. 23.Half of 126 =
  24. 24.Double 21 =
  25. 25.Double 24 =
  26. 26.Half of 198 =
  27. 27.Double 65 =
  28. 28.Double 58 =
  29. 29.Half of 168 =
  30. 30.Double 48 =
  31. 31.Double 41 =
  32. 32.Half of 186 =
  33. 33.Half of 32 =
  34. 34.Double 61 =
  35. 35.Half of 14 =
  36. 36.Double 11 =
  37. 37.Half of 194 =
  38. 38.Half of 148 =
  39. 39.Double 71 =
  40. 40.Half of 24 =

Answer key

  1. 162
  2. 21
  3. 138
  4. 64
  5. 76
  6. 102
  7. 166
  8. 6
  9. 51
  10. 98
  11. 90
  12. 174
  13. 152
  14. 37
  15. 76
  16. 83
  17. 192
  18. 52
  19. 41
  20. 89
  21. 8
  22. 71
  23. 63
  24. 42
  25. 48
  26. 99
  27. 130
  28. 116
  29. 84
  30. 96
  31. 82
  32. 93
  33. 16
  34. 122
  35. 7
  36. 22
  37. 97
  38. 74
  39. 142
  40. 12

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