help with these $2$ problems please

Given the following operands as $16$ bit integers, how many mutliplicand shifts will be

performed by doing binary multiplication by hand if we're following the algorithm from the

book?

$375$

$836$

$32$ shifts

$16$ shifts

$12$ shifts

None of these are correct

Question $5$

What MIPS commands will perform the following arithmetic and save the answer to $s $1?$

$123//247$

Assuming $123$ is stored in register $t$1,$ and $247$ is stored in register $t$2$

div $t$1$ $t$2$

mflo $s$1$

div $s$1,$ $t$1,$ $t$2$

div $t$1,$ $t$2,$ $s$1$

div $ t$1,$ $t$2$

mfhi $s$1$