Students learn how to use prime factors to work out the HCF and LCM.

As learning progresses they work out the HCF and LCM for real life problems.

**Differentiated Learning Objectives**

- All students should be able to calculate the LCM and HCF of a pair of integers using Prime Factors.
- Most students should be able to calculate the LCM and HCF of any number of integers using Prime Factors.
- Some students should be able to solve real life problems through the use of calculating the HCF or LCM.