Have your students build a functional bridge using a variety of materials for the lowest price possible. The bridge needs to be free standing, and it will be stress tested with weights. Once the students have built their bridges built they present them to the city council (aka, you and the rest of the class). This activity includes the student activity page, cost breakdown page and a four section rubric. Students love this activity and its cross curricular links allow you to cover science and language arts expectations.