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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 905 · 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 12 =
  2. 2.Double 22 =
  3. 3.Double 65 =
  4. 4.Double 47 =
  5. 5.Half of 42 =
  6. 6.Double 21 =
  7. 7.Double 61 =
  8. 8.Double 88 =
  9. 9.Double 98 =
  10. 10.Double 54 =
  11. 11.Half of 52 =
  12. 12.Half of 122 =
  13. 13.Half of 194 =
  14. 14.Half of 64 =
  15. 15.Double 87 =
  16. 16.Double 83 =
  17. 17.Half of 138 =
  18. 18.Double 91 =
  19. 19.Double 23 =
  20. 20.Double 24 =
  21. 21.Half of 102 =
  22. 22.Half of 182 =
  23. 23.Double 27 =
  24. 24.Half of 54 =
  25. 25.Half of 152 =
  26. 26.Double 53 =
  27. 27.Double 31 =
  28. 28.Half of 62 =
  29. 29.Half of 184 =
  30. 30.Half of 36 =
  31. 31.Half of 142 =
  32. 32.Double 64 =
  33. 33.Double 71 =
  34. 34.Double 69 =
  35. 35.Half of 44 =
  36. 36.Double 99 =
  37. 37.Double 84 =
  38. 38.Double 46 =
  39. 39.Double 51 =
  40. 40.Double 33 =

Answer key

  1. 24
  2. 44
  3. 130
  4. 94
  5. 21
  6. 42
  7. 122
  8. 176
  9. 196
  10. 108
  11. 26
  12. 61
  13. 97
  14. 32
  15. 174
  16. 166
  17. 69
  18. 182
  19. 46
  20. 48
  21. 51
  22. 91
  23. 54
  24. 27
  25. 76
  26. 106
  27. 62
  28. 31
  29. 92
  30. 18
  31. 71
  32. 128
  33. 142
  34. 138
  35. 22
  36. 198
  37. 168
  38. 92
  39. 102
  40. 66

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