Improvement of Elementary Fractions Instruction: Randomized Controlled Trial Using Lesson Study with a Fractions Resource Kit, United States, 2016-2018

This study involved random assignment of 80 school-based teams of educators to one of four conditions: (1) lesson study supported by a fractions resource kit; (2) lesson study without the fractions resource kit; (3) fractions resource kit without lesson study; or (4) practice-as-usual (no fractions resource kit, asked to refrain from lesson study). Teams were mailed the materials for their condition and used them locally. Each educator team included at least one grade 3 or 4 teacher who agreed to video record three fractions lessons, and their students comprise the student sample. Outcome measures focus on instruction, student fractions knowledge, teachers' fractions knowledge, beliefs about teaching-learning, and professional learning perceptions.