We (the West) were screwed over by those who brought Arabic numbers into Europe ... They should have reversed their order as they did it ... It makes addition and subtraction easier if you work them right to left as in the original Arabic
EDIT: To be clear, going from left to right is not inherently 'easier' but it would be more consistent with our direction of writing.
Over time we all realised that big-endian systems (IBM, 68k, etc, and our native western languages) were a hack and we've moved to little endian systems (intel, arm, DEC, ...) as sane