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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 353 · 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 89 =
  3. 3.Double 51 =
  4. 4.Double 94 =
  5. 5.Double 29 =
  6. 6.Half of 18 =
  7. 7.Double 93 =
  8. 8.Double 61 =
  9. 9.Half of 68 =
  10. 10.Double 37 =
  11. 11.Half of 108 =
  12. 12.Double 45 =
  13. 13.Double 48 =
  14. 14.Half of 86 =
  15. 15.Half of 154 =
  16. 16.Double 83 =
  17. 17.Double 72 =
  18. 18.Half of 62 =
  19. 19.Double 79 =
  20. 20.Double 21 =
  21. 21.Half of 22 =
  22. 22.Double 53 =
  23. 23.Half of 186 =
  24. 24.Double 34 =
  25. 25.Half of 192 =
  26. 26.Half of 102 =
  27. 27.Half of 78 =
  28. 28.Half of 138 =
  29. 29.Half of 32 =
  30. 30.Double 52 =
  31. 31.Half of 152 =
  32. 32.Half of 48 =
  33. 33.Half of 54 =
  34. 34.Half of 52 =
  35. 35.Half of 132 =
  36. 36.Double 11 =
  37. 37.Double 18 =
  38. 38.Double 55 =
  39. 39.Half of 146 =
  40. 40.Half of 82 =

Answer key

  1. 34
  2. 178
  3. 102
  4. 188
  5. 58
  6. 9
  7. 186
  8. 122
  9. 34
  10. 74
  11. 54
  12. 90
  13. 96
  14. 43
  15. 77
  16. 166
  17. 144
  18. 31
  19. 158
  20. 42
  21. 11
  22. 106
  23. 93
  24. 68
  25. 96
  26. 51
  27. 39
  28. 69
  29. 16
  30. 104
  31. 76
  32. 24
  33. 27
  34. 26
  35. 66
  36. 22
  37. 36
  38. 110
  39. 73
  40. 41

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