The Mayan numeral system had a symbol in it to represent nought for positional place value purposes whereas the Roman numeral system didn't need a nought figure because the positional place value of these numerals are self evident.
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The Mayan number system is vigesimal (based on twenties)The Roman number system is decimal (based on tens)
Both the Mayan and Roman number systems are non-positional, meaning the value of a symbol does not depend on its position within the number. Both systems use additive and subtractive principles to represent numbers. Both systems lack a symbol for zero, which can make calculations more challenging compared to the modern decimal system.
20
Mayan
They didn't have a money system, they bartered.