# How Can I Learn All of Sal's Math Tricks

When I watch Sal work through problems in videos like this, https://www.khanacademy.org/math/trigonometry/trig-equations-and-identities/challenge-trig-problems/v/2003-aime-ii-problem-14, I notice he does so many little tricks with fractions and simple arithmetic. I was wondering if these tricks are covered in the earlier math courses so I know if I should spend time on them. If not, how can I learn these? It would help a lot in speeding up problems in things like the SAT where time management matters.

(By arithmetic tricks I mean stuff like cross multiplication)

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