Math puzzle (med)

$shutterstock_1938140398$

$shutterstock_1941241756$

$1965185179$

$1968215380$

$1977309884$

$1978436114$

$1989282245$

$1989746513$

$1989498929$

$shutterstock_2004649265-1$

$2004649265$

$shutterstock_2004649265$

$2062990202$

$2020590701$

$2102410675$

$2133202613$

$2203326653$

$2214666155$

$2243218723$