prime factors of 18 please?! Also 375 and 225

I wil do one and then you can do the others.

 

prime factors of 375 please?

 

Well 5 goes into it

 

375=5*75      now five goes into 75 too.

 

375=5*5*15       now 5 goes into 15 too

 

375=5*5*5*3

 

they are all prime numbers so 

 

The prime factors of 375 are 3 and 5

 

all the other factors are composite.  :)