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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 765 · 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 62 =
  2. 2.Half of 142 =
  3. 3.Half of 42 =
  4. 4.Double 31 =
  5. 5.Double 16 =
  6. 6.Half of 26 =
  7. 7.Double 11 =
  8. 8.Double 28 =
  9. 9.Double 51 =
  10. 10.Half of 32 =
  11. 11.Double 63 =
  12. 12.Double 58 =
  13. 13.Double 29 =
  14. 14.Double 33 =
  15. 15.Double 34 =
  16. 16.Double 76 =
  17. 17.Half of 92 =
  18. 18.Double 21 =
  19. 19.Half of 122 =
  20. 20.Double 19 =
  21. 21.Half of 68 =
  22. 22.Double 56 =
  23. 23.Double 25 =
  24. 24.Double 35 =
  25. 25.Double 65 =
  26. 26.Half of 74 =
  27. 27.Double 27 =
  28. 28.Double 95 =
  29. 29.Double 18 =
  30. 30.Double 15 =
  31. 31.Half of 82 =
  32. 32.Half of 186 =
  33. 33.Half of 112 =
  34. 34.Double 71 =
  35. 35.Half of 22 =
  36. 36.Double 36 =
  37. 37.Double 97 =
  38. 38.Double 87 =
  39. 39.Double 92 =
  40. 40.Half of 102 =

Answer key

  1. 124
  2. 71
  3. 21
  4. 62
  5. 32
  6. 13
  7. 22
  8. 56
  9. 102
  10. 16
  11. 126
  12. 116
  13. 58
  14. 66
  15. 68
  16. 152
  17. 46
  18. 42
  19. 61
  20. 38
  21. 34
  22. 112
  23. 50
  24. 70
  25. 130
  26. 37
  27. 54
  28. 190
  29. 36
  30. 30
  31. 41
  32. 93
  33. 56
  34. 142
  35. 11
  36. 72
  37. 194
  38. 174
  39. 184
  40. 51

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