The Ratios & Proportions section ... the Common Core State Standards for Mathematics (CCSSM). Most of the lesson plans are also related to one or more other CCSSM domains. Each lesson plan provides a ...

Proportion refers to the equality of two ratios. When two ratios are proportional, it means they represent the same relationship. For instance, if 2/4 equals 3/6, these fractions are in proportion.

One fifth-grade student ... development of ratio and proportion concepts is embedded within the development of the multiplicative conceptual field. This article is available to members of NCTM who ...