Purpose: To advance a framework of indicators that promotes implementation of math standards under the Every Student Succeeds Act (ESSA), we tested a conceptual model of the resources and processes within schools that influence the opportunity to learn mathematics (OTL) in the classroom using a recent administration of the 2011 Trends in International Math and Science Study (TIMSS 2011). There is potential benefit to state departments and system-level practitioners from more information about how schools might influence student access to college and career-ready curriculum. Such information has the potential to shape the kinds of indicators stakeholders put in place to target problems and formulate solutions for math learning. Research Design: To test the fit of our hypothesized model of math content and instruction OTL, we applied structural equation modeling techniques to school and classroom data from 425 fourth-grade U.S. math teachers in TIMSS 2011. Findings: We found a direct influence of instructional leadership on OTL math instruction in the classroom and teacher participation in math professional development. Content-specific resources indirectly influenced both OTL math instruction and content through teacher preparedness. Conclusions: The results of this study demonstrate a potential framework through which school leaders can support the preparedness of teachers in providing students with equitable access to coherent, focused, and rigorous math content.