I think Romans used the abacus to calculate. https://cacm.acm.org/blogs/blog-cacm/234881-how-did-the-romans-calculate/fulltext https://cacm.acm.org/blogs/blog-

I think Romans used the abacus to calculate. https://cacm.acm.org/blogs/blog-cacm/234881-how-did-the-romans-calculate/fulltext https://cacm.acm.org/blogs/blog-cacm/234881-how-did-the-roma... https://en.wikipedia.org/wiki/Roman_abacus https://en.wikipedia.org/wiki/Roman_abacus