Interactive
Curated OER

All About Quadrilaterals

For Students 7th
In this quadrilateral post test worksheet, 7th graders answer ten multiple choice questions by solving questions based on quadrilaterals and angles of quadrilaterals. This is an interactive worksheet.
Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Shape Cutter

For Students Pre-K - 1st Standards
This computer tool allows students to compose and decompose shapes by making cuts and rearranging the pieces. The tool has an exploration section for learning exercises.