Is it possible math operations beetwen custom fields in toolset types plugin

It is possible with Custom PHP.

The Plugin does not feature any calculation methods, but you can use the Numeric Custom Field type and Custom PHP operators.

We cannot assist this sort of development, but here are a few links you might find helpful:
http://php.net/manual/en/ref.math.php
https://wp-types.com/documentation/customizing-sites-using-php/functions/