This brief is part of a continuing series for California education leaders on key policy issues related to teachers and teaching. With California in the process of revising its K-12 math framework and with educators and students grappling with lost instructional time during the COVID-19 pandemic, now is an opportune moment to examine ways to better understand and support effective math instruction in the Golden State. Accordingly, this brief summarizes California-specific findings from a nationwide survey on math teachers' perceptions of their materials, instruction, and professional learning. These insights into teachers' perspectives, along with a curated collection of resources and sources of support, can be used to inform timely improvements to math education in California.