Try selecting your column of numbers and then choosing Data/Text to Columns.

"wx4usa" wrote:

I have a file that was exported from Quick Books.

One column with numbers will not add because there is a little green
arrow in the upper left of each cell indicating it is formatted as
TEXT. I can select the cell individually and change the format to
general or currency - but I cannot select the entire column and change
it. If I select the entire column, it will only change the first non
numeric cell.