West Bengal Board Solutions for Chapter: Revision of Previous Lessons, Exercise 7: Let's work out 1.2

Find $2$ Two-digit numbers which are multiples of $4$.

Find three factors of $4$.

Find two numbers whose L.C.M is $12$ and their sum is $10$.

Find the H.C.F of the following, by finding the prime factors:
$36, 30$

Find the H.C.F of the following, by finding the prime factors:
$28, 35, 49$

Find the H.C.F of the following, by finding the prime factors:
$30, 72, 96$

Find the H.C.F of the following, by finding the prime factors:
$20$ and two numbers other than $0$.

Lets find the least number which is divisible by $18, 24$ and $42$.