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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 277 · 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 87 =
  3. 3.Double 91 =
  4. 4.Double 39 =
  5. 5.Double 17 =
  6. 6.Double 38 =
  7. 7.Double 66 =
  8. 8.Double 56 =
  9. 9.Half of 46 =
  10. 10.Double 49 =
  11. 11.Double 18 =
  12. 12.Half of 102 =
  13. 13.Double 62 =
  14. 14.Half of 132 =
  15. 15.Double 24 =
  16. 16.Half of 198 =
  17. 17.Double 71 =
  18. 18.Double 84 =
  19. 19.Half of 26 =
  20. 20.Double 15 =
  21. 21.Double 45 =
  22. 22.Half of 14 =
  23. 23.Half of 54 =
  24. 24.Half of 114 =
  25. 25.Half of 154 =
  26. 26.Double 88 =
  27. 27.Half of 22 =
  28. 28.Double 85 =
  29. 29.Double 12 =
  30. 30.Double 94 =
  31. 31.Half of 182 =
  32. 32.Half of 192 =
  33. 33.Double 75 =
  34. 34.Half of 52 =
  35. 35.Half of 126 =
  36. 36.Double 57 =
  37. 37.Double 61 =
  38. 38.Half of 62 =
  39. 39.Double 73 =
  40. 40.Half of 152 =

Answer key

  1. 102
  2. 174
  3. 182
  4. 78
  5. 34
  6. 76
  7. 132
  8. 112
  9. 23
  10. 98
  11. 36
  12. 51
  13. 124
  14. 66
  15. 48
  16. 99
  17. 142
  18. 168
  19. 13
  20. 30
  21. 90
  22. 7
  23. 27
  24. 57
  25. 77
  26. 176
  27. 11
  28. 170
  29. 24
  30. 188
  31. 91
  32. 96
  33. 150
  34. 26
  35. 63
  36. 114
  37. 122
  38. 31
  39. 146
  40. 76

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