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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 6 · 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 25 =
  3. 3.Half of 82 =
  4. 4.Double 35 =
  5. 5.Double 73 =
  6. 6.Half of 18 =
  7. 7.Half of 52 =
  8. 8.Double 65 =
  9. 9.Double 91 =
  10. 10.Double 55 =
  11. 11.Half of 142 =
  12. 12.Double 53 =
  13. 13.Double 41 =
  14. 14.Double 23 =
  15. 15.Double 32 =
  16. 16.Double 15 =
  17. 17.Half of 74 =
  18. 18.Double 27 =
  19. 19.Double 17 =
  20. 20.Half of 162 =
  21. 21.Half of 176 =
  22. 22.Double 21 =
  23. 23.Half of 78 =
  24. 24.Double 77 =
  25. 25.Double 18 =
  26. 26.Half of 136 =
  27. 27.Half of 154 =
  28. 28.Double 31 =
  29. 29.Double 47 =
  30. 30.Half of 62 =
  31. 31.Double 81 =
  32. 32.Double 11 =
  33. 33.Double 56 =
  34. 34.Half of 68 =
  35. 35.Half of 122 =
  36. 36.Half of 112 =
  37. 37.Half of 102 =
  38. 38.Double 34 =
  39. 39.Double 44 =
  40. 40.Half of 12 =

Answer key

  1. 142
  2. 50
  3. 41
  4. 70
  5. 146
  6. 9
  7. 26
  8. 130
  9. 182
  10. 110
  11. 71
  12. 106
  13. 82
  14. 46
  15. 64
  16. 30
  17. 37
  18. 54
  19. 34
  20. 81
  21. 88
  22. 42
  23. 39
  24. 154
  25. 36
  26. 68
  27. 77
  28. 62
  29. 94
  30. 31
  31. 162
  32. 22
  33. 112
  34. 34
  35. 61
  36. 56
  37. 51
  38. 68
  39. 88
  40. 6

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