Romans were using both : "metric/decimal" for numbers, but "imperial/dozenal" for fractions : https://en.m.wikipedia.org/wiki/Roman_abacus https://en.m.wikiped

Romans were using both : "metric/decimal" for numbers, but "imperial/dozenal" for fractions : https://en.m.wikipedia.org/wiki/Roman_abacus https://en.m.wikipedia.org/wiki/Roman_abacus (Base 12x5=60 was of course used by their Babylonian predecessors.)