A mother posted what she said was her child’s second-grade math homework. Here’s how the question goes: “There are 49 dogs signed up to compete in a dog show.

Second-grade teachers at Taylor Elementary School in Arlington, Va., had an idea: Look at the research on how homework affects young students and do what it says. They read studies done by Harris ...

A mother posted what she said was her child’s second-grade math homework. Here’s how the question goes: “There are 49 dogs signed up to compete in a dog show.