number writing systems are probably my second most intense obsession after text writing systems. i never actually got around to learning to write numbers in ancient greek but they had a whole scheme for it as well. and could write quite big numbers.

the arabs were the most elegant with their base 10 decimal number system though. they had fractions and were the first historically recorded culture to get close to a precise approximation of pi. the greeks were into that math stuff as well but their scheme was a bit confusing since it reused the alphabet.