To ignore all numbers stored as text, you need to open the Data tab and select the Text to Columns option. Then, select the Delimited option from the Convert Text to Columns wizard.

The purpose of the Convert Text to columns wizard is to separate the content of one excel cell into separate cells. You can set the delimiters that your data contain and set the column data format.

Navigate to the "Number" group within the "Home" tab in Excel. Click the small arrow beside the "Number Format" box. Click "Text" to convert your cells to text formatting.

Excel's Convert Text to Columns Wizard works only on one column at a time. If the data is in the first column, for example, click on the letter "A" above the column to select the entire column.