Why do Irathients use a base 18 number system and castithans a base 20 number system and they don’t use a base 10 number system like us? I know we use a base 10 system because we have 10 fingers, but Irathients and castithans have the same amount of fingers.

dedalvs: The Mayans also had ten fingers and they used a base 20 counting system. If it were based exclusively on the number of fingers we had, there would never in history have existed bases other than 10! Plenty of them have existed, though. Presently, Irathients use a base-20 number system just like the Castithans, […]