# High Common Factor (HCF)

- HCF is the highest common factor between the numbers.

# Lowest Common Multiple (LCM)

- LCM is the lowest common multiple between the numbers.

These topics are normally being taught in O-level E-maths classes.

**Question**

Solve the follow questions

- Find the HCF for 24 & 18.
- Find the LCM for 6 & 9.

**Answer**

*6**18*

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