[mnky9800n]

Imagine designing and building an aqueduct with Roman numerals.

[alberto_ol]

I think Romans used the abacus to calculate.

https://cacm.acm.org/blogs/blog-cacm/234881-how-did-the-roma...

https://en.wikipedia.org/wiki/Roman_abacus

[mnky9800n]

yes but they didn't use it to write down their plans.