Deleting digits

[amuriat]

Hi All.
Is there a way a can knock off an extra digit for instance I have about 10,000 barcodes with eleven digits the 11th digit is just arandom number which I want to get rid of so that I use the same barcodes. Please help

 

[jbeaucaire]

In another column, perhaps:

=LEFT(A1, 10)

...copied down.

 

[bobsan42]

or if it is a number and should stay a number:
=rownddown(A1/10,0)