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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 785 · 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 71 =
  2. 2.Double 15 =
  3. 3.Double 29 =
  4. 4.Double 35 =
  5. 5.Double 47 =
  6. 6.Half of 132 =
  7. 7.Half of 42 =
  8. 8.Half of 76 =
  9. 9.Double 11 =
  10. 10.Half of 142 =
  11. 11.Half of 28 =
  12. 12.Double 61 =
  13. 13.Double 69 =
  14. 14.Half of 24 =
  15. 15.Double 37 =
  16. 16.Double 13 =
  17. 17.Half of 118 =
  18. 18.Half of 194 =
  19. 19.Double 21 =
  20. 20.Half of 46 =
  21. 21.Double 65 =
  22. 22.Double 24 =
  23. 23.Double 16 =
  24. 24.Half of 154 =
  25. 25.Double 76 =
  26. 26.Half of 178 =
  27. 27.Half of 62 =
  28. 28.Double 94 =
  29. 29.Double 75 =
  30. 30.Half of 64 =
  31. 31.Double 62 =
  32. 32.Double 23 =
  33. 33.Double 33 =
  34. 34.Half of 56 =
  35. 35.Half of 84 =
  36. 36.Double 73 =
  37. 37.Double 25 =
  38. 38.Double 72 =
  39. 39.Double 39 =
  40. 40.Half of 34 =

Answer key

  1. 142
  2. 30
  3. 58
  4. 70
  5. 94
  6. 66
  7. 21
  8. 38
  9. 22
  10. 71
  11. 14
  12. 122
  13. 138
  14. 12
  15. 74
  16. 26
  17. 59
  18. 97
  19. 42
  20. 23
  21. 130
  22. 48
  23. 32
  24. 77
  25. 152
  26. 89
  27. 31
  28. 188
  29. 150
  30. 32
  31. 124
  32. 46
  33. 66
  34. 28
  35. 42
  36. 146
  37. 50
  38. 144
  39. 78
  40. 17

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