Penny, Amy, and Bernadette discuss how other superheroes can possibly pick up Thor's hammer. Bernadette suggests that, through the transitive property, the Hulk could pick it up by picking up Thor while he's holding his hammer. Amy disagrees with her, and Penny tries to apply the logic to picking up a guy at the bar.
The math club illustrates how to use the distributive property in reverse through factoring. As the members of the club explain, this technique can be used to check your work when utilizing the distributive property.
Bad Man poses two word problems to Ashley and Celia. Given a start and an end time, they need to calculate the duration of a train ride and the length of a video recording.