Girls Just Want to Have Sums

"Girls Just Want to Have Sums" is the nineteenth episode of the seventeenth season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on April 30, 2006. In this episode, a new school principal decides to segregating boys and girls classes, and Lisa is dissatisfied with the New Age-based girls maths class. So, she disguiseds herself as a boy called Jake Boyman to infiltrate the boys' classroom to be admitted to the actual maths class, and Bart mistakes his camouflaged sister as a new friend.

Plot
The Simpsons see a performance of Stab-a-Lot: The Itchy and Scratchy Musical. Juliana Kellner, the show's director and former student of Springfield Elementary School, greets the reception along with Principal Skinner, who acknowledges Juliana's straight As at the school but attributes her "B or two" in math to being a girl. Skinner's attempts to defend himself make the situation worse, and he is beaten by the Itchy and Scratchy puppeteers.

The next day, the teachers of Springfield Elementary stage a protest outside the school. Skinner holds a conference to address the protest. Nothing he says or does appeases the women, and he eventually collapses from exhaustion. Superintendent Chalmers introduces a new principal, Melanie Upfoot, whilst Skinner is demoted to serving as Groundskeeper Willie's assistant. Upfoot segregates the school across gender lines. Lisa initially looks forward to the all-girls school, but discovers Upfoot's math lessons are New Age. Lisa infiltrates the boys' school, where actual math is being taught. Lisa disguises herself as a boy named Jake Boyman and attends the boys' school, where she gets nicknamed "Toilet". After Lisa inadvertently gets into a fight with Nelson, Bart vows to help her blend into the boys' school.

Lisa is accepted by the boys, and is recognized for her performance in math. She then reveals her true identity. Bart claims she only did well because she learned to think like a boy. In response, she throws her award at him, and is shocked at her violent behavior. Lisa ends her speech by saying how proud she is of her feminism and her intelligence.

Awards
Matt Selman was nominated for a Writers Guild of America Award for Outstanding Writing in Animation at the 59th Writers Guild of America Awards for his script to this episode.