This document contains notes from a math lesson on percent increase and decrease. It includes examples of percent problems, such as calculating the new price of a game on sale with a 55% reduction. It also provides practice problems for students including finding the size of a 6th grade class that increased by 36% from the previous year. The document outlines key concepts like using the equation Quantity = Percent x Whole to solve percent problems and defines the whole and quantity in the context of increase and decrease.