In Lesson 4, students are asked to represent proportional situations in diagrams. Lesson 5 introduces the cross multiplication procedure and sampling techniques. It is important that students realize not all number patterns represent proportions. Lesson 6 asks students to gather data from different situations and describe them as proportional or not proportional. The extension activity compares direct and inverse relationships and also presents inverse relationships that are inverse proportions.
Students can calculate equivalent fractions.
Students can graph ordered pairs on a coordinate plane. See Activities E and F for additional materials. At a designated time of day, Students measure their heights. Students measure the length of their shadows. Record the class data in a table.