Here are 15 math problems from the SAT that people usually get wrong — with step-by-step explanations for how to solve them. Many people misread this question about the original price of a laptop.

In a Quora thread of the most difficult SAT math problems, one question emerged as "the meanest test problem ever." ... 15 common math questions from the SATs that everyone gets wrong; ...

Grid-in questions, or student-produced responses, account for about 22% of the 58-question SAT math section. As opposed to multiple-choice questions, where the correct answer is always one of the ...