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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 497 · 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 64 =
  2. 2.Double 25 =
  3. 3.Double 74 =
  4. 4.Double 75 =
  5. 5.Double 49 =
  6. 6.Half of 138 =
  7. 7.Double 13 =
  8. 8.Half of 112 =
  9. 9.Half of 24 =
  10. 10.Double 93 =
  11. 11.Double 26 =
  12. 12.Half of 84 =
  13. 13.Half of 74 =
  14. 14.Half of 144 =
  15. 15.Double 37 =
  16. 16.Double 87 =
  17. 17.Double 59 =
  18. 18.Half of 82 =
  19. 19.Double 46 =
  20. 20.Double 27 =
  21. 21.Double 72 =
  22. 22.Double 61 =
  23. 23.Half of 98 =
  24. 24.Half of 104 =
  25. 25.Half of 108 =
  26. 26.Half of 44 =
  27. 27.Double 84 =
  28. 28.Double 66 =
  29. 29.Double 78 =
  30. 30.Half of 134 =
  31. 31.Half of 28 =
  32. 32.Double 17 =
  33. 33.Half of 118 =
  34. 34.Half of 132 =
  35. 35.Double 22 =
  36. 36.Double 91 =
  37. 37.Half of 52 =
  38. 38.Double 83 =
  39. 39.Double 31 =
  40. 40.Double 16 =

Answer key

  1. 128
  2. 50
  3. 148
  4. 150
  5. 98
  6. 69
  7. 26
  8. 56
  9. 12
  10. 186
  11. 52
  12. 42
  13. 37
  14. 72
  15. 74
  16. 174
  17. 118
  18. 41
  19. 92
  20. 54
  21. 144
  22. 122
  23. 49
  24. 52
  25. 54
  26. 22
  27. 168
  28. 132
  29. 156
  30. 67
  31. 14
  32. 34
  33. 59
  34. 66
  35. 44
  36. 182
  37. 26
  38. 166
  39. 62
  40. 32

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