Michael Cioe, Sherryl King, Deborah Ostien, Nancy Pansa, and Megan Staples

Justification is a critical mathematical practice that must play a role in teaching and learning at all grade levels.

Gorjana Popovic

How do we introduce irrational numbers without simply telling students that they are irrationals?

M. Katherine Gavin and Linda Jensen Sheffield

Students think and act like mathematicians while using balance scales and bar diagrams and, most important, mathematical reasoning.

Zalman Usiskin

Common situations, like planning air travel, can become grist for mathematical modeling and can promote the mathematical ideas of variables, formulas, algebraic expressions, functions, and statistics.

Christina Eubanks-Turner and Najat Hajj

Get a bead on mathematical practices and habits of mind by using the real-world context of parade planning.