i'm not sure how to even approach this problem. any help?

Suppose $\displaystyle a,b,q,r e Z$ such that $\displaystyle a=bq+r$, $\displaystyle b>0$ and $\displaystyle 0<=r<b$. then $\displaystyle q=[a/b]$ and $\displaystyle r=a-b[a/b]$

(Hint. Use the uniqueness of the division algorithm).

thanks in advance!