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 ...

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 ...

A long-standing puzzle seems to constrain how addition and multiplication relate to each other. A graduate student has gone further than anyone else in establishing the connection. In 1983 the ...