The Percent format display the percent symbol and no decimal places. When you press the Alt key, you can observe below mentioned Ribbon tab showing shortcuts keys to press, e.g. Enter the hexadecimal code and then press alt and x keys to convert the code into triangle symbol. Here you will find 83 keyboard shortcuts for Word and Excel.
You can also use Format Cells to set the number of decimal places … Try Alt-H-0 to increase the number of decimal places, or Alt-H-9 to decrease them.