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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 840 · 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 21 =
  2. 2.Double 89 =
  3. 3.Double 54 =
  4. 4.Half of 36 =
  5. 5.Double 12 =
  6. 6.Half of 58 =
  7. 7.Half of 24 =
  8. 8.Half of 152 =
  9. 9.Half of 26 =
  10. 10.Double 73 =
  11. 11.Double 85 =
  12. 12.Half of 64 =
  13. 13.Double 57 =
  14. 14.Half of 198 =
  15. 15.Half of 48 =
  16. 16.Double 38 =
  17. 17.Half of 46 =
  18. 18.Double 71 =
  19. 19.Double 44 =
  20. 20.Half of 44 =
  21. 21.Half of 164 =
  22. 22.Double 36 =
  23. 23.Double 99 =
  24. 24.Double 97 =
  25. 25.Half of 42 =
  26. 26.Double 16 =
  27. 27.Double 67 =
  28. 28.Double 58 =
  29. 29.Double 66 =
  30. 30.Half of 18 =
  31. 31.Half of 72 =
  32. 32.Double 23 =
  33. 33.Double 31 =
  34. 34.Half of 146 =
  35. 35.Double 51 =
  36. 36.Half of 122 =
  37. 37.Double 25 =
  38. 38.Half of 162 =
  39. 39.Half of 22 =
  40. 40.Double 34 =

Answer key

  1. 42
  2. 178
  3. 108
  4. 18
  5. 24
  6. 29
  7. 12
  8. 76
  9. 13
  10. 146
  11. 170
  12. 32
  13. 114
  14. 99
  15. 24
  16. 76
  17. 23
  18. 142
  19. 88
  20. 22
  21. 82
  22. 72
  23. 198
  24. 194
  25. 21
  26. 32
  27. 134
  28. 116
  29. 132
  30. 9
  31. 36
  32. 46
  33. 62
  34. 73
  35. 102
  36. 61
  37. 50
  38. 81
  39. 11
  40. 68

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