The Florida education department has rejected 54 mathematics textbooks for its K-12 curriculum, citing reasons spanning the inclusion of critical race theory to Common Core learning concepts.

The rejected books make up a record 41% of the 132 books submitted for review, the Florida Department of Education said in a statement.

Of them, 28 were rejected because they “incorporate prohibited topics or unsolicited strategies, including [critical race theory],” the statement said.

Critical race theory has been described by scholars as an examination of racism and its impact through systems, such as legal, housing and education. However, it is typically not taught in K-12.

Twelve books were rejected because they did not meet Florida’s benchmark standards, while 14 books were rejected because they both included prohibited topics and failed to meet curriculum standards.

The names of the rejected books were not included.

Some Florida Democrats voiced their opposition to the move on Twitter.