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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 164 · 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 39 =
  2. 2.Double 34 =
  3. 3.Double 22 =
  4. 4.Double 31 =
  5. 5.Double 21 =
  6. 6.Half of 168 =
  7. 7.Half of 192 =
  8. 8.Double 73 =
  9. 9.Half of 126 =
  10. 10.Half of 48 =
  11. 11.Double 18 =
  12. 12.Double 41 =
  13. 13.Double 89 =
  14. 14.Half of 42 =
  15. 15.Half of 16 =
  16. 16.Half of 196 =
  17. 17.Double 87 =
  18. 18.Double 62 =
  19. 19.Double 43 =
  20. 20.Half of 72 =
  21. 21.Double 23 =
  22. 22.Double 32 =
  23. 23.Double 71 =
  24. 24.Half of 142 =
  25. 25.Double 15 =
  26. 26.Half of 122 =
  27. 27.Double 19 =
  28. 28.Double 35 =
  29. 29.Double 77 =
  30. 30.Double 88 =
  31. 31.Double 93 =
  32. 32.Half of 144 =
  33. 33.Half of 52 =
  34. 34.Half of 138 =
  35. 35.Double 12 =
  36. 36.Half of 34 =
  37. 37.Half of 12 =
  38. 38.Half of 26 =
  39. 39.Double 75 =
  40. 40.Double 86 =

Answer key

  1. 78
  2. 68
  3. 44
  4. 62
  5. 42
  6. 84
  7. 96
  8. 146
  9. 63
  10. 24
  11. 36
  12. 82
  13. 178
  14. 21
  15. 8
  16. 98
  17. 174
  18. 124
  19. 86
  20. 36
  21. 46
  22. 64
  23. 142
  24. 71
  25. 30
  26. 61
  27. 38
  28. 70
  29. 154
  30. 176
  31. 186
  32. 72
  33. 26
  34. 69
  35. 24
  36. 17
  37. 6
  38. 13
  39. 150
  40. 172

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