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Rocks are made of minerals, and minerals often have crystal shapes. In this fun activity about geometry in nature, learners create their own crystal shapes out of paper.

In this math lesson, learners identify, describe, and construct the five regular polyhedra.

In this activity, learners add squares to paper dominoes to make polyominoes.

In this activity, learners will build the highest tower they can out of recycled materials.

In this math lesson, learners arrange pattern blocks to create tessellations and to explore geometric patterns. Learners first explore making patterns with a variety of pattern blocks.

In this activity (on pages 49-54 of PDF), learners play with tangrams, a set of triangles, squares and a parallelogram that can combine into a larger square as well as all sorts of other shapes.

In this activity, learners explore how pictures change in curved mirrors. Learners make cylindrical mirrors by wrapping Mylar around soda cans.

Build a house you can fit inside, using cardboard tubes.

In this activity, learners practice drawing 3D structures in two dimensions. Learners draw cube stacks from five different points of view.