I am a new user to Excel so this is probably a common problem with an easy answer, but I can't figure it out. When I enter a number (200)in an individual cell and then click on another cell....the number changes (to 220)in the cell I just completed. I try to format the individual "changing" cell (from 220 back to the 200)but as soon as I leave that cell, it changes back to that 220 number. How do I enter 200 in a cell and keep it as a 200 number. Thanks.