Let's start with some shameless self-promotion: this week, Andreea Calude and I published a

paper on Indo-European numerals. We investigate how these languages form numerals beyond 1-10, so 11-99, 100s, and 1000s. There are many famous languages around with

crazy numeral systems but we were interested in both the regular and the crazy. For that purpose, we investigate data from Eugene Chan's amazing database

'Numeral system's of the world's languages' to get an overview of how regular and how crazy the Indo-European languages are.

Turns out there are indeed some well-known crazies to be found in Indo-European: Welsh, which forms 18 by 2 * 9, Breton, which forms 50 by 1/2 * 100, and Danish, which uses a base 10 for 20, 30, and 40, but a base 20 for 50, 60, 70, 80, and 90.

But aside from these rara in the expression of particular numbers, most languages form higher numerals in very regular ways. One particular interest of us is when languages start using syntagm…

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