Ninety is a shortening of “nine ten”. Eighty is a shortening of eight ten. Etc. All English numbers follow the same rule. Russian words don’t follow such rule. Similar shortenings are only for 50, 60, 70 and 80. 20 and 30 are also shortenings in a similar fashion, but slightly different. But words for 40 and 90 are just completely random and don’t follow any rules. The Russian 90 is actually a shortening of “nine hundred”. Just like 900 which sounds similar, lol.
Ninety is a shortening of “nine ten”. Eighty is a shortening of eight ten. Etc. All English numbers follow the same rule. Russian words don’t follow such rule. Similar shortenings are only for 50, 60, 70 and 80. 20 and 30 are also shortenings in a similar fashion, but slightly different. But words for 40 and 90 are just completely random and don’t follow any rules. The Russian 90 is actually a shortening of “nine hundred”. Just like 900 which sounds similar, lol.