TY - DATA T1 - Improvement of Elementary Fractions Instruction: Randomized Controlled Trial Using Lesson Study with a Fractions Resource Kit, United States, 2016-2018 AU - Lewis, Catherine AU - Schoen, Robert C. PY - 2022 DO - 10.3886/ICPSR38205.v1 PB - Inter-university Consortium for Political and Social Research [distributor] ER -