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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 999 · 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.Half of 42 =
  2. 2.Double 81 =
  3. 3.Double 31 =
  4. 4.Double 87 =
  5. 5.Double 92 =
  6. 6.Half of 34 =
  7. 7.Half of 138 =
  8. 8.Half of 38 =
  9. 9.Half of 26 =
  10. 10.Half of 194 =
  11. 11.Half of 142 =
  12. 12.Half of 86 =
  13. 13.Double 35 =
  14. 14.Half of 186 =
  15. 15.Double 36 =
  16. 16.Half of 118 =
  17. 17.Double 77 =
  18. 18.Double 67 =
  19. 19.Half of 192 =
  20. 20.Half of 48 =
  21. 21.Half of 84 =
  22. 22.Half of 12 =
  23. 23.Half of 172 =
  24. 24.Double 76 =
  25. 25.Double 88 =
  26. 26.Double 34 =
  27. 27.Double 68 =
  28. 28.Half of 158 =
  29. 29.Half of 68 =
  30. 30.Half of 168 =
  31. 31.Double 61 =
  32. 32.Double 71 =
  33. 33.Double 59 =
  34. 34.Double 55 =
  35. 35.Half of 22 =
  36. 36.Half of 92 =
  37. 37.Double 19 =
  38. 38.Double 41 =
  39. 39.Double 15 =
  40. 40.Half of 132 =

Answer key

  1. 21
  2. 162
  3. 62
  4. 174
  5. 184
  6. 17
  7. 69
  8. 19
  9. 13
  10. 97
  11. 71
  12. 43
  13. 70
  14. 93
  15. 72
  16. 59
  17. 154
  18. 134
  19. 96
  20. 24
  21. 42
  22. 6
  23. 86
  24. 152
  25. 176
  26. 68
  27. 136
  28. 79
  29. 34
  30. 84
  31. 122
  32. 142
  33. 118
  34. 110
  35. 11
  36. 46
  37. 38
  38. 82
  39. 30
  40. 66

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