Just comments about math

Hi all, 
   Why the results below are different? (On my casio scientific calculator, 
the two expressions below are equals to 381.4) 

=# select (3+0.2*707/80)*80; ?column? 
----------    381.4 

=# SELECT 80*(3+(707/80)*0.2); ?column? 
----------      368 
   Answer: "select 707/80;" returns 8, while "select 707/80::float" returns 
8.8375. 
   Abracos, 
   Edipo Elder    [edipoelder@ig.com.br] 

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