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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 480 · 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 34 =
  2. 2.Double 82 =
  3. 3.Double 28 =
  4. 4.Half of 142 =
  5. 5.Double 38 =
  6. 6.Double 51 =
  7. 7.Double 21 =
  8. 8.Half of 42 =
  9. 9.Half of 194 =
  10. 10.Half of 72 =
  11. 11.Double 23 =
  12. 12.Double 24 =
  13. 13.Half of 64 =
  14. 14.Half of 82 =
  15. 15.Half of 36 =
  16. 16.Half of 102 =
  17. 17.Half of 178 =
  18. 18.Double 64 =
  19. 19.Half of 146 =
  20. 20.Double 79 =
  21. 21.Half of 88 =
  22. 22.Half of 92 =
  23. 23.Double 69 =
  24. 24.Double 74 =
  25. 25.Double 15 =
  26. 26.Double 18 =
  27. 27.Half of 154 =
  28. 28.Half of 34 =
  29. 29.Half of 174 =
  30. 30.Double 32 =
  31. 31.Half of 136 =
  32. 32.Double 71 =
  33. 33.Half of 106 =
  34. 34.Double 92 =
  35. 35.Double 26 =
  36. 36.Double 77 =
  37. 37.Double 96 =
  38. 38.Half of 132 =
  39. 39.Double 13 =
  40. 40.Double 75 =

Answer key

  1. 68
  2. 164
  3. 56
  4. 71
  5. 76
  6. 102
  7. 42
  8. 21
  9. 97
  10. 36
  11. 46
  12. 48
  13. 32
  14. 41
  15. 18
  16. 51
  17. 89
  18. 128
  19. 73
  20. 158
  21. 44
  22. 46
  23. 138
  24. 148
  25. 30
  26. 36
  27. 77
  28. 17
  29. 87
  30. 64
  31. 68
  32. 142
  33. 53
  34. 184
  35. 52
  36. 154
  37. 192
  38. 66
  39. 26
  40. 150

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