Where does “jedenadvadsať” come from?

jedenadvadsať (Old Slovak) comes from Old Slovak jeden, from Proto-Slavic edìnъ, from Proto-Balto-Slavic edīˀnas, from Proto-Balto-Slavic aiˀnas, from Proto-Indo-European óynos — one; single.

Ancestry of “jedenadvadsať”, step by step

jedenadvadsať traces back through 3 separate lines of ancestry.

via Old Slovak jeden

StepLanguageWordMeaning
1Old Slovakjedenone
2Proto-Slavicedìnъone
3Proto-Balto-Slavicedīˀnas—
4Proto-Balto-Slavicaiˀnasone
5Proto-Indo-Europeanóynosone; single

via Old Slovak dvadsať

StepLanguageWordMeaning
1Old Slovakdvadsaťtwenty
2Proto-Slavic*dъva desęti—

via Old Slovak a

StepLanguageWordMeaning
1Old Slovaka—
Every word from Proto-Indo-European óynos →Every word from Proto-Balto-Slavic aiˀnas →Every word from Proto-Balto-Slavic edīˀnas →