HCF and LCM

Question 1

How do you prime factorise?

Answer 1

You find a factor pair of your original number. You then do that to the output. You do this until you just have prime numbers.

Question 2

How do you find the HCF of a and b?

Answer 2

If the prime factors of a is set A and for b B then the HCF is simply the product of the prime factors in A ⋂ B.

Question 3

How do you find the LCM of a and b?

Answer 3

If the prime factors of a is set A and for b B then the HCF is simply the product of the prime factors in A ⋃ B.