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Visit this site: http://www.tetrakys.es/en/

Description: Interlooping equilateral, isosceles, and scalene triangles for building two- and three-dimensional geometric objects, exploring area and volume, and visualizing fractions and arithmetic operations. The foam composition of these colorful manipulatives allows them to cling to smooth surfaces when wet, encouraging play in the tub or swimming pool. With games, challenges, a photo gallery, an audio-visual manual, and other supporting resources. See also the native version of the site, in Spanish.

Levels: Elementary
Languages: English, Spanish
Resource Types: Manipulatives, Educational Vendors
Math Topics: Basic Operations, Fractions/Decimals/Percents, Number Sense/About Numbers, Algorithms, Polyhedra, Euclidean Plane Geometry

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