Colleen O’Donnell Oppenzato has worked in the field of educational publishing since 1999, developing mathematics curricula for grades 2-11. Before that, Colleen participated in Teach for America and worked as a teacher of exceptional children at the middle school level. She has also worked as a fifth-grade teacher. She is currently completing a master’s degree in Cognitive Studies in Education at Teachers College, Columbia University.
Author of the chapter(s):
Addition and Subtraction of Fractions
Equations, Inequalities, and Functions
Single-Variable Equations and Inequalities
Using Ratios, Rates, and Proportions