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For years, students have been taught to cross multiply when presented with proportion problems. Few understood what they were doing or why they were doing it.

Produktbeschreibung
For years, students have been taught to cross multiply when presented with proportion problems. Few understood what they were doing or why they were doing it.

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Autorenporträt
Anne Collins is the director of the mathematics program at Lesley University. She has been providing mathematics content professional development institutes and courses for teachers for the past fifteen years and recently served on the NCTM Board of Directors (2010-2013). Linda Dacey, professor of mathematics and education at Lesley University, works with preservice and in-service teachers, helping them to develop both their content knowledge and their practice. Her research focuses on problem solving, number sense, and strategies for differentiation.