Numerical System
The Mayas used a positional base-twenty numerical system which only included whole numbers. For simple counting operations, a bar and dot notation was used. The dot represents 1 and the bar represents 5. A shell was used to represent zero. Numbers from 6 to 19 are formed combining bars and dots. Numbers can be written horizontally or vertically.
The value of a number depends on its position going from the bottom line upward in the configuration. The initial position (viz bottom line) has the value represented in the symbol. On the following line, the value of the symbol is multiplied by 20; on the third line from the bottom it's multiplied by 400, and each successive line is growing by powers of 20. That is to say, Mayan numerals use base 20. This positional system allows to calculate large figures, necessary for chronology and astronomy.
Read more about this topic: Maya Writing
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