RedCrab Calc
RedCrab is a scientific calculator with a full screen formula editor. The calculator displayes the result either under or next to the expression.
 
   
 Red Crab  Red Crab ToolBar File
   
 Red Crab ToolBar Edit  Red Crab ToolBar Insert
   
 Red Crab Tool Box  Red Crab Function Panel
 
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If you are doing math and don't have a TI Programmable Calculator, you are at a disadvantage.
Texas Instruments TI-83 Plus Graphing Calculator; 64 H x 96mm W Screen