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

In this activity, learners play a game and use pattern blocks to explore mirror images and reflection.

In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

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.

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.