This short video and interactive assessment activity is designed to teach third graders an overview of rectangles, squares, circles and triangles.

This short video and interactive assessment activity is designed to give fifth graders an overview of rectangles, squares, circles and triangles.

This short video and interactive assessment activity is designed to teach first graders an overview of rectangles, squares, circles and triangles.

This short video and interactive assessment activity is designed to teach third graders an overview of ellipses, trapezoids, rhombi, and polygons.

This short video and interactive assessment activity is designed to teach second graders an overview of ellipses, trapezoids, rhombi, and polygons.

This short video and interactive assessment activity is designed to give fifth graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to teach third graders about determining whether lines are perpendicular.

This short video and interactive assessment activity is designed to teach third graders an overview of quadrilaterals.

This short video and interactive assessment activity is designed to give fourth graders an overview of quadrilaterals.

This short video and interactive assessment activity is designed to teach second graders about counting the number of different 2d shapes in a composite figure.

This short video and interactive assessment activity is designed to teach third graders about counting the number of basic 2d shapes in a composite figure.

This short video and interactive assessment activity is designed to teach fifth graders about identifying basic 2d shapes in composite figures.

This short video and interactive assessment activity is designed to give fourth graders an overview of reflective symmetry.

This short video and interactive assessment activity is designed to teach second graders about identifying parallel and perpendicular lines.

This short video and interactive assessment activity is designed to teach third graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to teach second graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to give fourth graders an overview of quarter-circles and semi-circles.

This lesson unit is intended to help you assess how students reason about geometry and, in particular, how well they are able to: use facts about the angle sum and exterior angles of triangles to calculate missing angles; apply angle theorems to parallel lines cut by a transversal; interpret geometrical diagrams using mathematical properties to identify similarity of triangles.

This short video and interactive assessment activity is designed to teach third graders an overview of reflective symmetry.

This short video and interactive assessment activity is designed to teach first graders an overview of quarter-circles and semi-circles.