I think you need to format the cells.
FORMAT --> CELLS then choose "Number" or "Currency" or "Accounting" and you
can specify how many decimals you want to display.
REMEMBER if you enter 10.555 but display only 2 decimals, Excel will show
10.56 but the actual value of the cell will be 10.555. (can cause confusion
when adding a column of numbers.
Hope this helps