Integer from base 10 to base 2

Question

I do not understand the next method to tranform an integer from base 10 to base 2. Why is the first residue the last digit in the representation of base 2 and not the first? And so on.

Answer 1

The first residue is the result of dividing by $2^1$... the $n $-th the result of dividing by $2^n $... that is the reason. ..