BIDMAS explained for parents
21 October 2026
Understanding BIDMAS
BIDMAS is a rule that helps us work out sums in the correct order. It stands for Brackets, Indices, Division, Multiplication, Addition and Subtraction. Following this order is important so everyone gets the same answer.
Why BIDMAS matters for 11+ maths
In the 11+ exam, your child will face questions where the order of operations is key. Without BIDMAS, it is easy to make mistakes and get the wrong answer. Practising this rule builds confidence and accuracy.
Key insight: The order matters
If you add before you multiply, or ignore brackets, you will get a different result. BIDMAS makes sure everyone solves sums the same way.
Worked example
5 + 3 × 2
First, look for brackets or indices. There are none here.
Next, do any multiplication or division before addition or subtraction. 3 × 2 = 6.
Now add 5 + 6.
The correct answer is 11.
Supporting your child at home
Encourage your child to write out each step, checking for brackets and working through the BIDMAS order. Use simple examples first and build up to more complex sums as their confidence grows.
