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?
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Topics: Starter  Algebra  Place Value  Puzzles
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Previous Day  This starter is for 14 January  Next Day
Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=January14
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!