Geoboard

A geoboard is a mathematical manipulative used to explore basic concepts in plane geometry such as perimeter, area and the characteristics of triangles and other polygons.

It consists of a physical board with a certain number of nails half driven in, around which are wrapped geo bands that are made of rubber.

Geoboards were invented and popularized in the 1950s by Egyptian mathematician Caleb Gattegno (1911-1988).

Students are asked to place rubber bands around the nails to explore geometric concepts or to solve mathematical puzzles.

There are also a number of online virtual geoboards.