An octahedron is formed by connecting the centers of the faces of a cube. What is the ratio of the volume of the cube to that of the contained octahedron? 73 more words

## Tags » Spatial Reasoning

#### Prove it!

## The Activities

**Topic: Numbers:**Book: Missing Math: A Number Mystery by Loreen Leedy.**Topics: Spatial Reasoning and Drawing:**I made a fairly simple 3-dimensional sculpture out of 956 more words

#### Unicorns and Legos

## The Activities

**Topic: Square Numbers:**Book: My Full Moon Is Square by Pinczes.**Topic: Story Problems:**Navigate through a map of fantasy creature hexes, looking for the diamond hex. 533 more words