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What is the relationship between addition and subtraction? How do you know whether an algorithm will always work? Can you explain why order matters in subraction but not in addition or why it is false to assert that the sum of any two whole numbers is greater than either number? It is organised around two big ideas and supported by smaller, more specific, interconnected ideas (essential understandings). Gaining an understanding about addition and subtraction is essential as they are the foundation for students' later learning of multiplication and division. Essential Understanding Series...

This issue focuses on using research findings to make a difference for PreK-16 students' learning by improving instructional practices in classrooms. It helps bridge research and practice and includes research-based strategies for equitable and high-level instructional and assessment practices in mathematics classrooms.

Do your students say that one object is "bigger" than another without attending more precisely to the attribute they are comparing? Do they have difficulty naming numbers from 11 to 19? Do some students still count all while their classmates are counting on or counting by tens? What tasks can you offer-what questions can you ask-to determine what your students know or don't know-and move them forward in their thinking? This book focuses on the specialized pedagogical content knowledge that you need to teach number and numeration effectively in prekindergarten-grade 2. The authors...

"The Math Pact, High School is a handbook and go-to guide for ensuring equitable, coherent instruction across grades, schools, and your district"--