This document contains notes from a math lesson on adding and subtracting rational numbers. It includes a do now problem set with two fraction operations, references homework of completing problems on pages 50-51 and 56 of a problem set, and an exam taking place on 9/22. The lesson materials cover using a number line model to add and subtract rational numbers, including non-integer numbers. Students are asked to consider challenges of the number line model and to analyze an example of representing 8 + (2.1) on a number line.
