NASHVILLE, Tenn. (AP) -- More than 13,000 teachers across the state begin training this week in what education officials describe as the largest program of its kind in Tennessee history.

They will be trained in math curriculum standards to be implemented in grades 3-8 during the coming school year. They will be coached by more than 200 fellow teachers selected earlier this year for their role.

Training sessions last three weeks at 16 schools across Tennessee.

Similar training will be done a year from now in English/language arts.