> It's quite plain that French uses a base-10 number system with some irregular number names Well, it has two interesting irregularities on two of the multiple

> It's quite plain that French uses a base-10 number system with some irregular number names Well, it has two interesting irregularities on two of the multiples of 10 that are the origin of the base-20 theory: 80 and 90. They are "quatre vingt" and "quatre vingt dix", literally "four twenty" and "four twenty ten". 70 is also "soixante dix", literally "sixty ten".