Factorise the following number into primes.

$216$

Factorise the following number into primes.

$208$

Factorise the following number into primes.

$765$

Factorise the following numbers into primes.

 $342$

Factorise the following number into primes. 

$377$

Factorise the following number into primes:

$559$

Write all the factors of the numbers and find the greatest common divisor.

$28$ and $42$

Write all the factors of the numbers and find the greatest common divisor.

$51, 27$

Write all the factors of the numbers and find the greatest common divisor.

$25, 15, 35$