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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 909 · 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 39 =
  3. 3.Double 51 =
  4. 4.Double 63 =
  5. 5.Double 79 =
  6. 6.Half of 48 =
  7. 7.Double 14 =
  8. 8.Half of 166 =
  9. 9.Double 42 =
  10. 10.Half of 98 =
  11. 11.Double 86 =
  12. 12.Half of 38 =
  13. 13.Half of 76 =
  14. 14.Double 72 =
  15. 15.Half of 16 =
  16. 16.Half of 54 =
  17. 17.Double 46 =
  18. 18.Half of 84 =
  19. 19.Double 43 =
  20. 20.Double 68 =
  21. 21.Half of 184 =
  22. 22.Double 62 =
  23. 23.Half of 14 =
  24. 24.Half of 102 =
  25. 25.Half of 136 =
  26. 26.Double 58 =
  27. 27.Half of 78 =
  28. 28.Half of 172 =
  29. 29.Half of 168 =
  30. 30.Half of 114 =
  31. 31.Half of 156 =
  32. 32.Half of 132 =
  33. 33.Double 53 =
  34. 34.Double 31 =
  35. 35.Double 22 =
  36. 36.Double 61 =
  37. 37.Half of 92 =
  38. 38.Double 87 =
  39. 39.Half of 24 =
  40. 40.Double 76 =

Answer key

  1. 142
  2. 78
  3. 102
  4. 126
  5. 158
  6. 24
  7. 28
  8. 83
  9. 84
  10. 49
  11. 172
  12. 19
  13. 38
  14. 144
  15. 8
  16. 27
  17. 92
  18. 42
  19. 86
  20. 136
  21. 92
  22. 124
  23. 7
  24. 51
  25. 68
  26. 116
  27. 39
  28. 86
  29. 84
  30. 57
  31. 78
  32. 66
  33. 106
  34. 62
  35. 44
  36. 122
  37. 46
  38. 174
  39. 12
  40. 152

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