Respuesta :
its D. because 6 = 600 so 2 tens + 600 = 620 so 15 plus all of the above is 645 :D hope this helped
The answer would be D because you have 6 hundreds and the 2 tens and 15 ones because if you took out ten from the ones then you would get 3 tens and 5 ones. The hope I didn't confuse you