Working out the LCM of two numbers
- find the prime factors of both numbers
- add all the numbers to a Venn diagram
- multiply every number
- check it is correct by dividing by each number
Working out the HCF of two numbers
- find the prime factors of both numbers
- add all the numbers to a Venn diagram
- multiply every number in the intersection (middle)
- check it is correct by dividing each number by your answer
