## How to use BIDMAS to Solve an Equation

This section explains BIDMAS and how to use BIDMAS to solve an equation.

The term BIDMAS is used to help you remember the order in which to complete a calculation.

BIDMAS is an acronym which stands for:

**B**rackets

**I**ndices

**D**ivision

**M**ultiplication

**A**ddition

**S**ubtraction

You therefore start with the brackets and follow the above order. Remember that dividing and multiplying come before adding and subtracting.

An example of using BIDMAS would be:

Calculate 3+4 x 8. For this example we start by multiplying and then we add. So the answer is 3+ 32 = 35 (as 4 x8 is 32 which we then add to the 3).

Now if we use an example with brackets we can try:

56 - 3² (2+2) Firstly we calculate the sum in the brackets 2+2 = 4.

56 - 3² (4) We then work out the power (powers are numbers with indices) 3² = 9.

56- 9 x 4 We then do the multiplication so 9 x 4 = 36.

56 – 36 = 20 We then complete the calculation by subtracting to give us our answer 20.

For our next example we must calculate the numerator (top part of a fraction) and the denominator (the bottom part of the fraction).

__8 +6 __ = __14__ = __14 __ = 0.14

(8-3) x 20 5 x20 100

**Key terms: **

**Powers** are numbers with Indices.

**Numerator** is the top part of a fraction.

**Denominator** is the bottom part of a fraction.