Website
National Council of Teachers of Mathematics

The Math Forum: Making Patterns

For Teachers Pre-K - 1st Standards
Explore the literature connections, online activity, pencil and paper activity, and the manipulative investigation of patterns and geometric shapes on this page!
Lesson Plan
PBS

Pbs Mathline Lesson: Geometry, It's a Perfect Fit [Pdf]

For Teachers 3rd - 5th Standards
This two-part geometry lesson plan has students identify, describe, and classify two-dimensional shapes. Students engage in hands-on activities including identifying shapes in the classroom, creating patterns with shapes, identifying...
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Common Core Sheets

Common Core Sheets: Counting Mixed Objects

For Teachers 1st - 2nd
Teachers can assess students knowledge of counting shapes with these printable worksheets.
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Common Core Sheets

Common Core Sheets: Geometry 7.g.3 Worksheets

For Teachers 7th Standards
Print or create worksheets to assess students' understanding of geometrical figures and describe the relationships between them.
Activity
National Council of Teachers of Mathematics

The Math Forum: Line Symmetry

For Teachers 3rd - 5th Standards
This site from The Math Forum is a great site if you are looking for activities to engage your students in learning about line symmetry. Peruse this collection of activities for one or two or four that would be right for your students....