..We use conversion factors to change from one SI prefix to another! This is used transform the unit of quantity without actually changing its value.
An example:
To convert 1 inch into cm, firstly we have to know the relation between inch and cm.
![1 inch = 2.54 cm](https://img.qammunity.org/2021/formulas/physics/middle-school/6bmjw87c2fpd55vtizwrpjgmtxw4m9spuo.png)
Hope this helps!
~sofia