Cause this is really interesting whats happening right here. so this is five thousand, plus nine hundred, plus ninety.... nine ten cans.. and now i have no more ones right? because i took all of these and put it into the ten can. i hope i'm not confusing you.. so how many ten cans do we have? well we had nine, now we had one more... so we have ten ten cans. so we could write this, instead of five thousand, nine hundred, ninety ten, maybe we could write it as... and you can see we're gonna go through this several times.. we could rewrite this as.. five thousand, nine hundred, and then ten tens, which is weird and i think i confused you right? cause thats the number of ten cans we have and then zero ones leftover. i'm doing this for a reason.. 