That's also convention talking. Looking at the number 443937215, it's trivial to identify the first two or the last two digits. And for counting digits to get a

That's also convention talking. Looking at the number 443937215, it's trivial to identify the first two or the last two digits. And for counting digits to get an idea of the magnitude, we use separators like so: 443,937,215 (or 443.937.215 depending on what country you're in). The only difference is whether you estimate this number as "about four hundred and forty million" or "about ten and five hundred million"