If you are converting more than one column of text to numbers, this is an excellent method to use. Select a blank cell and type 1 into it. Then press Press CTRL + C to copy the cell.

To fix DataFormat.Error, We couldn't convert to Number, when working with data in Power Query, whether in Excel or Power BI use these solutions ...

Microsoft Excel depends on data that’s stored correctly. If you receive text values that should be real numbers, use one of these methods to get you back to the real work.