Seventh graders explore the concept of percents, ratios, and proportions. In this percents, ratios, and proportion lesson plan, 7th graders have 237 ounces of beads to weigh. Students work in groups to weigh the beads in a way so that each group member has a different percentage of the total weight. Students calculate percents, proportions, and ratios of the amount of beads they have compared to the total amount.