ISBN 0873536223 books & textbook
Developing Essential Understanding of Ratios, Proportions, and Proportional Reasoning for Teaching Mathematics: Grades 6–8
Joanne Lobato Amy Ellis Rose Mary Zbiek Rose Mary Zbiek
NCTM /2010-04-27 Paperback / 88 Pages
isbn-10: 0873536223 / isbn-13: 9780873536226
