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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 506 · 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 93 =
  2. 2.Double 37 =
  3. 3.Double 17 =
  4. 4.Half of 152 =
  5. 5.Half of 184 =
  6. 6.Double 83 =
  7. 7.Double 65 =
  8. 8.Half of 156 =
  9. 9.Half of 112 =
  10. 10.Double 16 =
  11. 11.Double 46 =
  12. 12.Half of 116 =
  13. 13.Half of 16 =
  14. 14.Half of 72 =
  15. 15.Double 66 =
  16. 16.Half of 42 =
  17. 17.Double 99 =
  18. 18.Half of 122 =
  19. 19.Double 71 =
  20. 20.Half of 148 =
  21. 21.Half of 182 =
  22. 22.Half of 56 =
  23. 23.Half of 92 =
  24. 24.Double 32 =
  25. 25.Double 53 =
  26. 26.Half of 108 =
  27. 27.Half of 178 =
  28. 28.Half of 58 =
  29. 29.Half of 68 =
  30. 30.Double 25 =
  31. 31.Half of 66 =
  32. 32.Double 51 =
  33. 33.Double 55 =
  34. 34.Double 34 =
  35. 35.Half of 94 =
  36. 36.Double 91 =
  37. 37.Half of 44 =
  38. 38.Half of 114 =
  39. 39.Double 72 =
  40. 40.Double 15 =

Answer key

  1. 186
  2. 74
  3. 34
  4. 76
  5. 92
  6. 166
  7. 130
  8. 78
  9. 56
  10. 32
  11. 92
  12. 58
  13. 8
  14. 36
  15. 132
  16. 21
  17. 198
  18. 61
  19. 142
  20. 74
  21. 91
  22. 28
  23. 46
  24. 64
  25. 106
  26. 54
  27. 89
  28. 29
  29. 34
  30. 50
  31. 33
  32. 102
  33. 110
  34. 68
  35. 47
  36. 182
  37. 22
  38. 57
  39. 144
  40. 30

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