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.