This lesson is to re-enforce the concept of solving proportions (cross multiplying) using small groups , partners, or even individuals while allowing students to practice the concept in an independent way. This activity takes the idea of a scavenger hunt and allows students to freely walk through the classroom solving problems and discussing answers. For example, students will solve the problem within a card and the answer will lead them to the next card. You may place the cards around the room in easy to find places or make them hunt for not only answers but for the next card as well. Students can begin at any card and if they make a mistake the activity allows them to discover and correct their mistakes immediately. Every year my 7th graders look forward to repeating this activity.