This can make sense for currency, but units of weight and distance and so on are infinitely divisible. You can just have a third of a metre if you like. Or 333 mm if the inaccuracy is acceptable. And so on.
And it's not like 1 is some special value. If you start from a base of 120cm you get enough even divisions that you rarely run into the need for fractions
And it's not like 1 is some special value. If you start from a base of 120cm you get enough even divisions that you rarely run into the need for fractions