More than one quarter of Oklahoma’s public schools received a grade of F or D on annual report cards released by the state Department of Education.

The State Board of Education gave final approval Wednesday to the letter grades, which are being posted on the department’s website.

The report shows 16 percent of Oklahoma schools received A grades, 26 percent received a B, 28 percent got a C, 17 percent a D, and 11 percent received an F. Nearly 30 schools, or 2 percent, did not receive a letter grade.

Compared to last year’s grades, more schools received an F or D, and fewer schools received an A.