In this lesson, students look at ratios of different populations in the world and determine what their class would be like if its ratios were equivalent. Let's use math to better understand our world. Required Materials: internet-enabled device tools for creating a visual display four-function calculators. Internet-enabled devices are only necessary if students will conduct research to find quantities that they need to know. Tools for creating a visual display are only needed if you would like students to present their work in an organized way and have the option of conducting a gallery walk.