Here are 15 math problems from the SAT that people usually get wrong — with step-by-step explanations for how to solve them.

A Quora thread of difficult SAT math questions included one described as the "meanest test problem ever." Can you figure it out?

Although the organization's own research showed the new SAT was overloaded with wordy math problems, the test makers pushed forward anyway, documents reveal.

Extra time on the math portion of the SAT helps the most able students the most.