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
Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
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!