Numbers and Their Operations — Proportion

About this lesson

This unit introduces the concept of proportion as an equality of at least two ratios or rates. It explains how to identify proportional and non-proportional relationships using cross multiplication and graphical representation, where points lie on a straight line passing through the origin. Students learn to solve proportions for unknown values and apply proportions to real-life problems such as pricing, distance, speed, and weight comparisons. The unit includes worked examples, self-evaluations, and exercises involving scenarios like buying books, running distances, car travel, and weight on the moon versus Earth. By the end, students should be able to determine if quantities are proportional, solve proportions, and represent proportional relationships graphically.