If you can forget math, it means that you memorized it. I don't think one can ununderstand math. Oftentimes math is taught as a set of rules. Do these steps in

If you can forget math, it means that you memorized it. I don't think one can ununderstand math. Oftentimes math is taught as a set of rules. Do these steps in order to get the answer. Works well to pass the test with minimum effort, does not help much long term.