How is it possible for a grade school math textbook to be about Critical Race Theory?

Florida has just banned 41% of its math textbooks, at least some of which were alleged to contain CRT. Link. I can’t imagine how a math book could do this. Are odd numbers being discriminated against? And what about negative numbers? Is zero trying to take over the real numbers by multiplying itself against everyone else?

Although the banned books were listed, no examples were given as to why they were considered offensive. See if you can think of what they might have done.