Often you will be presented with a formula that will need to be manipulated in order to be useful to you.

You may have to rearrange the formula, making a different letter the subject.

Use the rules of equations (i.e. do the same to both sides) to achieve this.

**Example:**

The formula for finding a temperature in degrees centigrade from one in Fahrenheit is shown below.

Rearrange the formula to make **F **the subject.

**Answer:**

Our aim is to get **F** on its own on the left-hand side.

**Now it's over to you.**