Jharne De Solutions for Chapter: HCF and LCM, Exercise 3: Exercise

Check if the first number is a factor of the second number:

$9, 45$

Which of the following numbers are divisible by $4$?

$2028$

Check if the first number is a factor of the second number: $15, 60$

Check if the first number is a factor of the second number:

$13, 42$

Check if the first number is a factor of the second number:

Write all the pairs of twin primes less than $20$. Also find whether $49$ and $51$ are twin primes or not.

Write five pairs of co-prime numbers.

Write the number of multiples of $23$ between $80$ and $180$.