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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 630 · 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 69 =
  2. 2.Double 78 =
  3. 3.Double 27 =
  4. 4.Double 35 =
  5. 5.Double 91 =
  6. 6.Half of 142 =
  7. 7.Half of 72 =
  8. 8.Half of 16 =
  9. 9.Double 33 =
  10. 10.Double 61 =
  11. 11.Double 71 =
  12. 12.Double 75 =
  13. 13.Double 34 =
  14. 14.Half of 14 =
  15. 15.Half of 122 =
  16. 16.Double 25 =
  17. 17.Half of 106 =
  18. 18.Double 82 =
  19. 19.Double 43 =
  20. 20.Double 41 =
  21. 21.Double 49 =
  22. 22.Double 73 =
  23. 23.Half of 56 =
  24. 24.Half of 164 =
  25. 25.Half of 82 =
  26. 26.Half of 198 =
  27. 27.Double 31 =
  28. 28.Double 57 =
  29. 29.Half of 38 =
  30. 30.Double 76 =
  31. 31.Half of 52 =
  32. 32.Half of 128 =
  33. 33.Double 92 =
  34. 34.Double 67 =
  35. 35.Double 39 =
  36. 36.Double 64 =
  37. 37.Double 11 =
  38. 38.Double 55 =
  39. 39.Half of 102 =
  40. 40.Half of 28 =

Answer key

  1. 138
  2. 156
  3. 54
  4. 70
  5. 182
  6. 71
  7. 36
  8. 8
  9. 66
  10. 122
  11. 142
  12. 150
  13. 68
  14. 7
  15. 61
  16. 50
  17. 53
  18. 164
  19. 86
  20. 82
  21. 98
  22. 146
  23. 28
  24. 82
  25. 41
  26. 99
  27. 62
  28. 114
  29. 19
  30. 152
  31. 26
  32. 64
  33. 184
  34. 134
  35. 78
  36. 128
  37. 22
  38. 110
  39. 51
  40. 14

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