Base-10 blocks

A set of blocks to represent numbers. In Everyday Mathematics, the four standard sizes of blocks are called cubes, longs, flats, and big cubes from smallest to largest. Once one of these is designated as the unit whole, the values of the other blocks follow. For example, if the cube is the unit whole, then the long, flat, and big cube represent 10, 100, and 1,000 respectively. However if the flat is the unit whole, then the cube, long, and big cube represent 1//100, 1//10, and 10 respectively. The cube is 1 cm on each edge. The long is 10 cm by 1 cm by 1 cm. The flat is 10 cm by 10 cm by 1 cm. The big cube looks like 1,000 cubes and is 10 cm by 10 cm by 10 cm. See long, flat, and big cube for photos of the blocks.