Girls Just Want to Have Sums

Principal Skinner is replaced by a women's education expert after making a sexist statement about women’s math skills during a musical (which was written by a former female Springfield Elementary school student who was a math whiz), who segregates the school by gender. At first, Lisa loves the arrangement, but when she discovers that the girls' classes are more about self-esteem boosting than actual learning, Lisa disguises herself as a boy and attends the boys' classes.