Question

Find the product of the greatest and the smallest three digit numbers formed with the digits $6,3$ and $8$

Answer 1

Smallest three digit number using the digits $6,3$ and $8$ is $368$

Greatest three digit number using the digits $6,3$ and $8$ is $863$

Product$=368\times 863$

$=(370-2)\times (860+3)$

$=370(860+3)-2(860+3)$

$=3,18,200‬+1,110‬-1,720‬-6$

$=3,19,310‬-1,726$

$=3,17,584$