<p>I agree with mifune. There’s maybe 5 formulas you “truly” have to know, even though they’re so common and basic that you should have known them by now (slope formula, probability, etc.).</p>
<p>Currently, I have distance formula, the quadratic formula, a logarithm program, and one that will do the Pythagorean theorem written on my calculator. Having these things allows for me to do things more quickly when I need them and focus more time/energy on actual thinking work. I’m pretty sure I used them like twice on the SAT math and a few more on the Math2 Subject test.</p>