Math achievement takes more than effort--it requires aligning instruction with how students acquire, build, retain, and apply knowledge. Drawing on cutting-edge research, this timely book shows educators how to leverage research-validated practices and approaches to make math more accessible and meaningful to all K–12 learners. The authors explain the principles of explicit instruction and delve into specific strategies for teaching math language and representations, fluency, word-problem solving, and other key areas. Designed for utility, chapters include lesson planning guidance, clear steps to follow, instructional dos and don'ts, and math-tivities that help teachers build and apply new skills.