When you are converting units, you should already be able to convert between metric units.

**For example. What is 17cm in mm?**

We know there are 10 mm in 1 cm, so we have to multiply by 10. This gives us 170 cm.

**How to convert algebraic units.**

When we are dealing with the quantities as algebra, the same rules will apply. We still use conversion factors

We just have to do them in terms of the original algebraic quantity.

**Example 1: Convert K cm into mm. **

We know that to change cm into mm we multiply by 10. This means K cm = 10K mm

**Example 2: Convert P m/s into km/hr**

This is a two step problem.

1) We know that there are 3600 seconds in 1 hour

P metres = 1 second

3600P metres = 1 hour

2) We know there are 1000m in a kilometre.

3600P metres = 1 hour

3.6P km = 1 hour

Therefore P m/s = 3.6P km/hr