This booklet consists of five sample lessons integrating population education into mathematics instruction. It is one of four in a series. Materials differ from those in an earlier series (1980) in that lessons are presented at the secondary level only; there is no duplication of lessons from the earlier series in content and teaching strategies. Lessons are not only aimed at developing skills in applying addition, multiplication, their inverse operations, computing rates, arithmetical means, and average, but also are aimed at developing knowledge about various population concepts. Thus, addition, multiplication, and their inverse operations are used for computing sex ratio, population change, fertility rate, rate of natural increase, migration rate, and growth rate. A lesson teaching the construction of a frequency table using data on family size is followed by a lesson relating dependency ratios to population composition. In a final lesson, percentage is used to solve problems related to population projection and doubling time (the number of years it takes for a population to double itself). Each lesson contains a box which provides the user with information on content, objectives, grade level, and subject into which population education should be integrated. Although the main body of each lesson varies, in most cases lessons contain a narrative of the content and some evaluation questions at the end. Lessons were adapted from materials derived from Malaysia and the Philippines. (LH)