Back when the Spanish had driven the Moors south monks were picking over the wonderful libraries they had left behind, one of the treasures they discovered was what we now call arabic numbers - but they screwed up, they took the numbers as they saw them whole into their writing system. They took numbers meant to be written in a right to left writing system into a left to right system without reversing them.

Writing numbers smallest digits first is particularly useful in business - when you add numbers together the result can be written in order, you don't have to guess and leave enough space for the answer to fit into.

But it's also screwed us over down the generations - it's the cause for our computers' big-endian vs. little-endian sillyness - took us a generation and we finally have decided that, well, the original arabic way of doing it was right