Critics of the Kansas Board of Education’s decision to adopt national standards for math and reading urged the board to reconsider its decision to join the education program.

Opponents of the Common Core standards, which were developed by a national consortium, spent nearly two hours criticizing the standards during a hearing Tuesday.

Kansas is among 46 states that have adopted the national standards, which set out the academic expectations for students from kindergarten through high school. Kansas adopted the standards in 2010 and school districts have begun implementing them in the classrooms and in teacher training.

Critics argue that Common Core is too expensive and turns over local districts’ control of education standards to a national consortium.

Supporters say the standards will improve academic rigor.