This is one site that cannot be missed. It caters to the many aspects of the learning and study of mathematics. It is primarily designed to assist teachers in locating curriculum resources, but now includes numerous links to Internet resources for science and math teaching. This is a collection of descriptions of well-known constants associated with mathematics. A fractal is a rough or fragmented geometric shape that can be subdivided into parts, each of which is a reduced-size copy of the whole.
Fractals are generally self-similar and independent of scale.
It is an extensive collection of educational software, links to other sites that are of interest to mathematicians. A Great Site where you can find practically anything that you need. This is a help resource for 4th through 8th grades. The Mayans devised a counting system that was able to represent very large numbers by using only 3 symbols, a dot, a bar, and a symbol for zero.