Calling all number detectives!

Look at this symbol:

We know it is the **equals** sign but what does it actually mean?

It means the** same as** and doesn’t just mean the answer.

Look at the following calculation:

**7 + 5 x 3 = 10 x 2+ ( __ )**

Both sides of the calculation must be equal.

We need to work out the answer to the left side of the calculation before we can work out the mystery number on the right side of the calculation.

We must follow the rules of** BIDMAS** (or BODMAS) in these calculations.

When you complete a calculation using BIDMAS, you answer anything in b**rackets **first, then any **indices **(squared and cubed numbers), then the **division** and **multiplication **parts, followed by the **addition** and subtraction parts.

Following the rules of BIDMAS, we must calculate** 5 x 3** first and then add** 7**. This gives us** 22.**

So the answer on the right must equal 22. 10 x 2 is **20** so the mystery number must be** 2** to make a total of** 22**.

**7 + (5 x 3) = (10 x 2) + 2**

Pssstt!! Here’s a handy hint to help you reach superstar status:

Remember to follow the rules of BIDMAS.

It’s now your turn to complete the calculation! Good luck!