$25\cdot 7\cdot 4=25\cdot 4\cdot7=100\cdot7=700$

$\underline{324\cdot 18} \\ \phantom{2\cdot}324 \\ \phantom{69 }24_1 6_32$

$\phantom{+}3~~~2~~~4~~~0 \\ \underline{+2~~~4_2~6_3~~2}\\ \phantom{+}5~~~8~~~3~~~2$