Apply General Format in Excel Spreadsheets

General is the default number format setting for cells in Excel.
Select the cells and press Control + Shift + ~ (Tilde).
Note: The tilde character is a little wavy line and is generally found on a key to the right of the apostrophe key, near the Enter key (based on UK/Ireland keyboard).
Screen Reader users can get format details for a cell by pressing the Screen Reader key + F.