4 ms·
The Romans used an abacus to multiply numbers: https://en.wikipedia.org/wiki/Roman_abacus https://en.wikipedia.org/wiki/Roman_abacus
by DonaldFisk 4y ago
The Romans used an abacus to multiply numbers: https://en.wikipedia.org/wiki/Roman_abacus https://en.wikipedia.org/wiki/Roman_abacus