It came as some surprise to me that
sata, the Finnish word for one hundred, shares a common root with
hundred itself.
(a) It doesn't sound even vaguely similar, but that's evolution of language for you; French
cent and hundred aren't immediately obviously related, let alone Russian
сто.
(b) Proto-Finno-Uralic languages aren't supposed to have
any common roots with Proto-Indo-European languages ... ah OK, it's a loan word.
Evolution of “hundred” in Indo-European languages