Download or read book EMPower Math, Keeping Things in Proportion: Reasoning with Ratios, Student Edition written by Contemporary and published by McGraw-Hill Education. This book was released on 2011-06-06 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Students use various tools—objects, diagrams, tables, graphs, and equations—to understand proportional and non-proportional relationships.