<Tr> <Td> List of numeral systems </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Adding and subtracting numbers below 20 using Maya numerals is very simple . Addition is performed by combining the numeric symbols at each level: </P>

Which of the following is an accurate description of the maya mathematical system