[Math Lair] Numbers in Indo-European

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Here are the names of the numbers from 1 to 10 in several different Indo-European languages.
Englishonetwothreefourfivesixseveneightnineten
Germaneinszweidreivierfünfsechssiebenachtneunzehn
Swedishetttvåtrefyrafemsexsjuåttaniotio
Norwegianentotrefirefemsekssyvåtteniti
Frenchundeuxtroisquatrecinqsixsepthuitneufdix
Italianunoduetrequattrocinqueseisetteottonovedieci
Spanishunodostrescuatrocincoseisseiteochonuevediez
Portugueseumdoistrêsquatrocincoseisseteoitonovedez
Catalanundostresquatrecincsissetvuitnoudeu
Latinunusduotresquattorquinquesexseptemoctonovemdecem
Russianodindvatrichetyrepyat'shest'sem'vosem'devyat'desyat'
Polishjedendwatrzyczterypięćsześćsiedemosiemdziewięćdziesięć
Welshundautripedwarpumpchwechsaithwythnawdeg
Greekeîsdúotreiîstéssarespéntehexheptáoktóennéadéka

Even though several linguistic families such as Germanic (English, German, Swedish, and Norwegian), Romance (French, Italian, Spanish, Portuguese, Catalan, and Latin), Slavonic (Russian and Polish), Celtic (Welsh) and Greek are represented here, the words for the numerals 1 to 10 are quite similar in all of those languages. All of these languages are Indo-European languages, and are descended from one original language (called Indo-European), which is the ancestor of most modern European and Indian languages, Latin, Greek, Sanskrit, and other languages.

Indo-European has been reconstructed, and the following are the Indo-European words for the numerals 1 through 10, as well as 100 and 1000. Notice the similarities between these words (at least the words for 1 through 10) and all of the words above:
oneoinos
twodwo
threetrejes
fourqetwor
fivepempe
sixsweks
sevenseptm
eightokto
ninenewn
tendekm
hundredkmtom
thousandsm-gheslom

See also some other word-related mathematical recreations.