If you rearrange a formula, you change the variable which is its **subject**.

In **A = b × h **(the formula for area of a rectangle), **A** is the subject, because it is on its own on one side of the equals sign.

You can change the subject of the formula by using **inverse** operations.

Have a look at an example below.

**e.g. v = u + at (formula for final velocity). Make a the subject of the formula.**

We need to inverse the operations.

Let's first move **u** to the other side by subtracting it from both sides:** v - u = at**

**at** means **a × t**, so to reverse this, we need to divide both sides by **t: (v - u) ÷ t = a**

Now **a **is the subject of the formula, as it is on its own on one side of the equation.

See how **(v - u) **is in brackets?

This is because we want to divide the entire left-hand side by **t**, not just** v** or **u**.

Now it's your turn to inverse those operations!

In this activity, we are going to rearrange formulae to make different terms the subject using inverse operations.