I can read your mind!
Think of a two digit number,*
Reverse the digits to get another two digit number,
Subtract the smaller two digit number from the other,
Add the digits of your answer together
I know what your answer is!
(* The two digits must be different)
9
How did I know?
Topics: Starter  Algebra  Place Value  Puzzles
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=January14 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a related student activity.
If you like this sort of thing Mystic Mathematical Mind Reader will amaze you!
Spooky sound effect (Ambient Darkness) is by D J Chronos at Freesound.org