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The Bill and Melinda Gates Foundation is supporting Scholastic and Marilyn Burns as they develop this Math Reasoning Inventory.

Looking for information to hand out to parents about math? These Parent Roadmaps developed by the Council of the Great City Schools are very simple, straightforward documents that inform parents about Common Core math concepts at each grade level.

"This site provides an extensive collection of free resources, math games, and hands-on math activities aligned with the Common Core State Standards for Mathematics. Our math printables are suitable for use in math centers, small group or whole class settings. Instructions for each activity are presented in large print on a task card in child-friendly language to enable students to work on tasks independently after a brief introduction to the task. All files are in PDF format and can be accessed using Adobe Reader. Also available are Math Journal Tasks (K-5), Math Vocabulary Resources (Gds. 2-5) and Math Projects (Gds. 3-5) for teachers looking for ways to support students' math writing skills while developing key concepts and skills. See our E-Books page for more information on these resources."

This is an interesting look at how Americans have led the way in developing math instruction but not following through on it (according to the NY Times author).

How to develop a circle equation in algebraic form when the circle touches the horizontal x-axis and learn how algebra is used in geometry to derive the equation of a circle in algebraic form in mathematics.