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Odd Shape Out

big solutions to little problems

Jo Ann Cady and Pamela Wells

Solutions to a previous Solve It problem are discussed, and the procedures used with problem solving are explored.

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Joel Amidon and Matt Roscoe

A monthly set of problems is aimed at a variety of ability levels.

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Ryota Matsuura and Yu Yan Xu

This activity involves finding the distance between two points in a coordinate plane and emphasizes reasoning from repeated calculations, which is one of the mathematical practices specified by the Common Core State Standards for Mathematics.

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Joel Amidon and Matt Roscoe

A monthly set of problems is aimed at a variety of ability levels.

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Joel Amidon and Matt Roscoe

A monthly set of problems is aimed at a variety of ability levels.

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Math for Real: How Much Time Will Lena Save?

“when will I ever use this?”

Dan Miltner

This problem ties in the Pythagorean theorem while two people walk around or across a park.

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Alessandra King

Students are called to engage their creativity and problem-solving skills by designing their own puzzles. They share them with their classmates and produce an anthology that will be a keepsake of their mathematical year as well as a memento of their collective accomplishment.

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Kate M. Degner

An activity explores how to estimate the height of trees. Activity sheets are included.

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Joel Amidon and Matt Roscoe

A monthly set of problems is aimed at a variety of ability levels.

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Hyewon Chang and Barbara J. Reys

Using Clairaut's historic-dynamic approach and dynamic geometry tools in middle school can develop students' conceptual understanding before they encounter formal proof in geometry.