How to remember maths formulae?

Firstly, you should read it hardly. Secondly, you should understand how the formulae came and you will remember maths formulae.

This is the biggest ever task that students used to have in front of them when it comes to maths that is how to remember the formulas. But lets see it from another angle, why do we need to remember? cant it come to us naturally when need it? yes it can, by doing lots of exercise as lots of our friends mentioned in their answers here. But now my question is can we construct the formula mentally when when we need it? yes we can but only when we understood how the formula came and its meaning and definition. Remember, by practice we din mean that practice formulae only by writing it some 100 times, by practice we mean that solve as many problems as possible.
So combination of both understanding the basic concept and lots and lots of practice can only make maths formulae as friend of you.
Hope you understand, any doubts, comments and suggestions are welcome.