The Scalability, Capacity, and Learning Engagement (SCALE) project is a five-year study of Fraction Face-Off (FFO) to determine the extent to which FFO improves fraction knowledge and math outcomes of students experiencing moderate mathematics difficulty. Funded by the U.S. Department of Education and in partnership with UT at Austin and Mizzou, RME is conducting randomized controlled trials in grades 4-8, using FFO as a small group math intervention.