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Doubles and Halves Trick Worksheet

Maths tricks trick 5: Doubles and halves game · Set 793 · 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 34 =
  2. 2.Double 12 =
  3. 3.Double 33 =
  4. 4.Half of 124 =
  5. 5.Half of 128 =
  6. 6.Double 45 =
  7. 7.Double 31 =
  8. 8.Half of 92 =
  9. 9.Half of 26 =
  10. 10.Double 11 =
  11. 11.Double 85 =
  12. 12.Half of 188 =
  13. 13.Double 51 =
  14. 14.Double 62 =
  15. 15.Double 26 =
  16. 16.Half of 186 =
  17. 17.Half of 178 =
  18. 18.Double 21 =
  19. 19.Double 71 =
  20. 20.Half of 158 =
  21. 21.Half of 42 =
  22. 22.Double 15 =
  23. 23.Half of 182 =
  24. 24.Half of 56 =
  25. 25.Half of 48 =
  26. 26.Half of 198 =
  27. 27.Double 56 =
  28. 28.Double 19 =
  29. 29.Half of 112 =
  30. 30.Double 79 =
  31. 31.Double 22 =
  32. 32.Half of 16 =
  33. 33.Half of 46 =
  34. 34.Double 48 =
  35. 35.Half of 118 =
  36. 36.Double 98 =
  37. 37.Double 84 =
  38. 38.Double 73 =
  39. 39.Double 29 =
  40. 40.Double 66 =

Answer key

  1. 68
  2. 24
  3. 66
  4. 62
  5. 64
  6. 90
  7. 62
  8. 46
  9. 13
  10. 22
  11. 170
  12. 94
  13. 102
  14. 124
  15. 52
  16. 93
  17. 89
  18. 42
  19. 142
  20. 79
  21. 21
  22. 30
  23. 91
  24. 28
  25. 24
  26. 99
  27. 112
  28. 38
  29. 56
  30. 158
  31. 44
  32. 8
  33. 23
  34. 96
  35. 59
  36. 196
  37. 168
  38. 146
  39. 58
  40. 132

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