Continue exploring rational numbers, working with an area model for mu ltiplication and division with fractions, and examining operations wit h decimals. Explore percents and the relationships among representatio ns using fractions, decimals, and percents. Examine benchmarks for und erstanding percents, especially percents less than 10 and greater than 100. Consider ways to use an elastic model, an area model, and other models to discuss percents. Explore some ratios that occur in nature.