I can open the school excel files but none of the calucations work

I work in a primary school in Zimbabwe and we use excel files called gradebook for teachers to do their marks for their classes.

We recently installed linux in our computer lab and so have i on my laptop but when i open the file with Libre calc it opens but will not perform any calcutations when I enter marks.

Don’t worry, this sometimes happens when using the XLS-file. Try to keep your workbooks in ODS-files (ODF-format).

Please check: is this option is set to ON for this file?

Autocalculate