Trying to divide the variable in a field by a constant in a new field using the formula

“Hlf_OZ” / 300

This produces an error

"The data content could not be loaded.

This function is not supported: VARCHAR in [Select “Ingredient” AS “Ingredient” , “Half_OZ” AS “Half_OZ”, “Two_OZ” AS “Two_OZ”, “Half_OZ”/300 from “Essential Oils” ORDER BY “Ingedients” ASC]

When I enter the formula “Hlf_OZ” * 300 there is no problem. ???

Your time and assistance is greatly appreciated in assisting with this issue.

~ Respect