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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 340 · 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 51 =
  2. 2.Double 25 =
  3. 3.Double 14 =
  4. 4.Double 76 =
  5. 5.Double 15 =
  6. 6.Double 91 =
  7. 7.Double 69 =
  8. 8.Double 54 =
  9. 9.Double 72 =
  10. 10.Double 35 =
  11. 11.Double 94 =
  12. 12.Half of 56 =
  13. 13.Half of 138 =
  14. 14.Double 57 =
  15. 15.Double 81 =
  16. 16.Double 41 =
  17. 17.Double 49 =
  18. 18.Half of 64 =
  19. 19.Double 52 =
  20. 20.Double 87 =
  21. 21.Half of 42 =
  22. 22.Double 31 =
  23. 23.Double 21 =
  24. 24.Half of 44 =
  25. 25.Double 34 =
  26. 26.Double 36 =
  27. 27.Half of 186 =
  28. 28.Double 37 =
  29. 29.Half of 22 =
  30. 30.Half of 62 =
  31. 31.Double 45 =
  32. 32.Half of 144 =
  33. 33.Half of 118 =
  34. 34.Half of 182 =
  35. 35.Double 73 =
  36. 36.Double 61 =
  37. 37.Double 67 =
  38. 38.Half of 94 =
  39. 39.Half of 102 =
  40. 40.Half of 18 =

Answer key

  1. 102
  2. 50
  3. 28
  4. 152
  5. 30
  6. 182
  7. 138
  8. 108
  9. 144
  10. 70
  11. 188
  12. 28
  13. 69
  14. 114
  15. 162
  16. 82
  17. 98
  18. 32
  19. 104
  20. 174
  21. 21
  22. 62
  23. 42
  24. 22
  25. 68
  26. 72
  27. 93
  28. 74
  29. 11
  30. 31
  31. 90
  32. 72
  33. 59
  34. 91
  35. 146
  36. 122
  37. 134
  38. 47
  39. 51
  40. 9

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