Answer :
the answer is 768, when doing addition it makes it way simpler to stack them on top of each other and do one at a time, so you`d do 6+2 which equals 8, then you`d add 3+3 which equals 6, then lastly you`d add 5+2 which equals 7. when that`s all together you get your answer 768 :) i hope that made sense haha