TROY, N.Y. — David Javsicas, a popular seventh-grade reading teacher known for urging students to act out dialogue in the books they read in class, sometimes feels wistful for the days when he taught math.

A quiz, he recalls, could quickly determine which concepts students had not yet learned. Then, “you teach the kids how to do it, and within a week or two you can usually fix it,” he said.

Helping students to puzzle through different narrative perspectives or subtext or character motivation, though, can be much more challenging. “It could take months to see if what I’m teaching is effective,” he said.

Educators, policy makers and business leaders often fret about the state of math education, particularly in comparison with other countries. But reading comprehension may be a larger stumbling block.