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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 449 · 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 17 =
  2. 2.Double 91 =
  3. 3.Double 38 =
  4. 4.Double 13 =
  5. 5.Double 29 =
  6. 6.Double 77 =
  7. 7.Double 87 =
  8. 8.Half of 36 =
  9. 9.Double 72 =
  10. 10.Half of 42 =
  11. 11.Double 46 =
  12. 12.Double 21 =
  13. 13.Half of 146 =
  14. 14.Half of 26 =
  15. 15.Half of 186 =
  16. 16.Half of 72 =
  17. 17.Half of 192 =
  18. 18.Double 22 =
  19. 19.Double 64 =
  20. 20.Double 31 =
  21. 21.Double 61 =
  22. 22.Double 63 =
  23. 23.Double 97 =
  24. 24.Half of 104 =
  25. 25.Half of 84 =
  26. 26.Half of 38 =
  27. 27.Double 82 =
  28. 28.Double 81 =
  29. 29.Half of 102 =
  30. 30.Half of 188 =
  31. 31.Double 88 =
  32. 32.Double 85 =
  33. 33.Half of 52 =
  34. 34.Half of 172 =
  35. 35.Double 96 =
  36. 36.Half of 152 =
  37. 37.Double 42 =
  38. 38.Half of 46 =
  39. 39.Half of 142 =
  40. 40.Double 48 =

Answer key

  1. 34
  2. 182
  3. 76
  4. 26
  5. 58
  6. 154
  7. 174
  8. 18
  9. 144
  10. 21
  11. 92
  12. 42
  13. 73
  14. 13
  15. 93
  16. 36
  17. 96
  18. 44
  19. 128
  20. 62
  21. 122
  22. 126
  23. 194
  24. 52
  25. 42
  26. 19
  27. 164
  28. 162
  29. 51
  30. 94
  31. 176
  32. 170
  33. 26
  34. 86
  35. 192
  36. 76
  37. 84
  38. 23
  39. 71
  40. 96

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