$252 = 105 \cdot 2 + 42$, then $105 = 42 \cdot 2 + 21$

$252 = 105 \cdot 2 + 42$, then $42 = 105 \cdot 0 + 42$

$252 = 105 \cdot 3 + 21$, then $105 = 21 \cdot 5 + 0$

$252 = 105 \cdot 2.4 + 0$, then $105 = 0$