Old ratio, proportion and percentage book
This old book from 1993 focuses on the three concepts of ratio, proportion and percentage, which are some of the most important new ideas to be taught in the upper primary and lower secondary school years. The real world of mathematics involves the application of proportion and percentage extensively. The basis for both of these aspects is the concept of ratio.
The booklet considers a teaching sequence that can be used to establish each of the concepts of ratio, proportion and percentage. A model is shown which demonstrates how the two concepts of rate and ratio are related, but at the same time quite different.