This slide deck summarizes findings from the Inclusive Mathematics Environments Early Career Fellowship about creating inclusive environments for students from minoritized and marginalized groups in mathematics, with a focus on the middle childhood through mid-adolescence developmental stage. Research completed by the fellows suggests five interrelated guiding principles for creating more inclusive mathematics environments: mathematics educators need critical consciousness; mathematics curriculum should reflect a more expansive view of mathematics, including the history of mathematical concepts, the uses of mathematics in different cultures, and the application of mathematics for understanding current events; mathematics curriculum and instruction should be adaptable so that it is relevant to the specific students in the class; mathematics curriculum and instruction should feature meaningful opportunities to engage in collaborative work; and assessment practices and policies should prioritize deep mathematical thinking, exploration, and collaboration. The deck outlines and contextualizes the research underlying these principles and suggests directions for future research.