You need to show that the slash is text not a math operator
either =CONCATENATE(A1, "/",A1)
or, more simply, =A1 & "/" & A1
best wishes
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
remove caps from email

"Mike" wrote in message
...
I want to change my data, in excel, from the form, e.g (100) to (100/100)
for another software to recognize the data. The data is huge and wish I
could
do it automatically .
I have tried the 'Concatenate' formula but it returns the product of the
formula instead of the form I want it. Any help please?

=concatenate A1,/A1 meant to change (100) to (100/100) returns (1)