Quote:
Originally Posted by aceplace57
Thank you for explaining the misdirection sbunny8.
I see now how clever they were. Adding steps to hide what they were really doing.
Understanding how it's designed makes me appreciate the trick much more.

To make the trick less obvious, they should reverse the digits.
Pick a number between 11 and 99.
Take the second digit and multiply it by five.
Add three.
Multiply it by two.
Add the first digit from your original number.
What number did you come up with?
Your original number is...
All they do is take the number you gave them, subtract six, and reverse the order of the digits. But because of that reversal the trick is less obvious.
With the original trick
17 => 11
30 => 24
44 => 38
57 => 51
66 => 60
82 => 76
105 => 99
Even a person with limited arithmetic skills might spot such a simple pattern.
With the reverse trick
17 => 11
48 => 24
89 => 38
21 => 51
73 => 76
12 => 60
105 => 99