The Maya numerals – the number system of the Maya – was used for calendrical indications and calculations. The counting method was not based on the ten system we are familiar with, but on the twenty system.
The Maya used exclusively positive whole numbers. For calculations they used a system of additions and subtractions, similar to our present-day arithmetic system.
Higher numbers were represented in a place value system.
For calendar dates, a different system was used with digits 1, 17, 360, 7200, and 144000.