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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 534 · 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 87 =
  2. 2.Double 97 =
  3. 3.Double 63 =
  4. 4.Half of 86 =
  5. 5.Double 71 =
  6. 6.Double 47 =
  7. 7.Half of 164 =
  8. 8.Half of 34 =
  9. 9.Half of 118 =
  10. 10.Half of 106 =
  11. 11.Half of 18 =
  12. 12.Half of 114 =
  13. 13.Double 43 =
  14. 14.Half of 54 =
  15. 15.Double 76 =
  16. 16.Half of 126 =
  17. 17.Half of 38 =
  18. 18.Double 84 =
  19. 19.Double 61 =
  20. 20.Half of 148 =
  21. 21.Half of 104 =
  22. 22.Half of 14 =
  23. 23.Double 24 =
  24. 24.Half of 58 =
  25. 25.Double 11 =
  26. 26.Double 69 =
  27. 27.Double 31 =
  28. 28.Double 23 =
  29. 29.Double 45 =
  30. 30.Half of 102 =
  31. 31.Double 58 =
  32. 32.Double 41 =
  33. 33.Half of 146 =
  34. 34.Double 32 =
  35. 35.Double 86 =
  36. 36.Double 89 =
  37. 37.Half of 98 =
  38. 38.Half of 52 =
  39. 39.Half of 16 =
  40. 40.Half of 72 =

Answer key

  1. 174
  2. 194
  3. 126
  4. 43
  5. 142
  6. 94
  7. 82
  8. 17
  9. 59
  10. 53
  11. 9
  12. 57
  13. 86
  14. 27
  15. 152
  16. 63
  17. 19
  18. 168
  19. 122
  20. 74
  21. 52
  22. 7
  23. 48
  24. 29
  25. 22
  26. 138
  27. 62
  28. 46
  29. 90
  30. 51
  31. 116
  32. 82
  33. 73
  34. 64
  35. 172
  36. 178
  37. 49
  38. 26
  39. 8
  40. 36

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