As long as you leave the height of the row at the standard size, you can use this trick to display the number the way you want. Select the cell and then call up the "Format Cells" dialog box... select the Number tab and then select "Custom Format" and type this in the Type field...
0.0,,,%%
then put the text cursor between the last comma and first percent sign and press CTRL+J (the percent signs will look like they disappeared)... then click the "Alignment" tab and put a check mark in the "Wrap text" checkbox... finish off by clicking the OK button.