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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 505 · 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 19 =
  2. 2.Double 21 =
  3. 3.Half of 42 =
  4. 4.Half of 176 =
  5. 5.Double 41 =
  6. 6.Half of 158 =
  7. 7.Double 65 =
  8. 8.Half of 168 =
  9. 9.Half of 36 =
  10. 10.Double 74 =
  11. 11.Double 86 =
  12. 12.Half of 46 =
  13. 13.Half of 134 =
  14. 14.Half of 122 =
  15. 15.Double 69 =
  16. 16.Half of 64 =
  17. 17.Double 87 =
  18. 18.Double 39 =
  19. 19.Half of 58 =
  20. 20.Half of 16 =
  21. 21.Half of 132 =
  22. 22.Double 93 =
  23. 23.Half of 118 =
  24. 24.Half of 198 =
  25. 25.Double 18 =
  26. 26.Double 14 =
  27. 27.Double 77 =
  28. 28.Half of 12 =
  29. 29.Double 43 =
  30. 30.Half of 136 =
  31. 31.Half of 76 =
  32. 32.Double 92 =
  33. 33.Half of 86 =
  34. 34.Double 42 =
  35. 35.Double 89 =
  36. 36.Double 67 =
  37. 37.Double 38 =
  38. 38.Half of 184 =
  39. 39.Double 32 =
  40. 40.Double 78 =

Answer key

  1. 38
  2. 42
  3. 21
  4. 88
  5. 82
  6. 79
  7. 130
  8. 84
  9. 18
  10. 148
  11. 172
  12. 23
  13. 67
  14. 61
  15. 138
  16. 32
  17. 174
  18. 78
  19. 29
  20. 8
  21. 66
  22. 186
  23. 59
  24. 99
  25. 36
  26. 28
  27. 154
  28. 6
  29. 86
  30. 68
  31. 38
  32. 184
  33. 43
  34. 84
  35. 178
  36. 134
  37. 76
  38. 92
  39. 64
  40. 156

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