David Spitzer wrote:
> puts 'Hello what is you\'re Favorite Number?'

Well, there's your /first/ syntax error.

> puts 'I think ' + (number.to_i + 1) + ' may be a better favorite number
> though...'

Since "+" can mean either "concatenate strings" or "add numbers", you 
need a "to_s" there, just as you needed "to_i" before trying arithmetic.
-- 
John W. Kennedy
  "Though a Rothschild you may be
In your own capacity,
     As a Company you've come to utter sorrow--
But the Liquidators say,
'Never mind--you needn't pay,'
     So you start another company to-morrow!"
   -- Sir William S. Gilbert.  "Utopia Limited"