WASHINGTON (AP) -- How can students learn math, when the teacher doesn't know much more about the subject than the pupils?
That's one of the questions raised by a new report by a children's advocacy group, the Education Trust.
The report is based on Education Department data. It says in high-poverty schools, two in five math classes have teachers without a college major or certification in math.
And in schools with a greater share of African-American and Latino children, nearly one in three math classes is taught by such a teacher.
Math is considered a "gateway" course, one that leads to greater success in college and the workplace.
The crucial learning time for students is in grades 5 through 8.
Researchers acknowledge it can be tougher to find qualified teachers for middle schools, especially in low-income areas.