Question

Fill in the blank

$\begin{array}{ccc}36& 49& \left(117\right)\\ 23& 36& \left(45\right)\\ 45& 57& (-)\end{array}$

Answer 1

Sum of terms of a $\times$ Sum of terms of b = c
$3+6=9;4+9=13;9$ $\times$ $13=117$
$2+3=5;3+6=9;5$ $\times$ $9=45$
$4+5=9;5+7=12;9$ $\times$ $12=108$