Converting between Octal and Decimal Numbers

$1.$ Convert $13378$ to decimal $($base $10)$

Use sum of expansion of products $($don$$t skip steps!$)$

$2.$ Convert $7110$ to octal $($base $8)$

Use the Double$-$Dabble method of successive division

$3.$ What file permissions does the octal

number $5$ exhibit?

$4.$ What file permissions does the octal

number $3$ exhibit?

p$\mathrm{.}1$