"Make sure they are stored as text, not numbers (select cells, right click, Format Cells, select ""Text"" in Number tab.) Data > Sort, make sure Header row is set correctly (look at selected cells), OK You should now have a dialog asking ""The following sort key may not sort as expected because it contains some numbers formatted as text:"", select ""Sort numbers and numbers stored as text separately""
Once you've done this the sort button on the toolbar/ribbon should work as you want it."