ISBN 9780873537179 books & textbook
Putting Essential Understanding of Ratios and Proportions into Practice in Grades 6–8
Travis A. Olson Melfried Olson Hannah Slovin Barbara J. Dougherty
NCTM /2015-03-15 Paperback / 142 Pages
isbn-10: 0873537173 / isbn-13: 9780873537179
