Missing Numbers in Mixed BIDMAS
22 October 2026
When your child sees a calculation with a missing number and different operations, it can feel confusing at first. Using the order of operations, or BIDMAS, helps break the problem into simple steps.
Worked example
6 × (□ + 2) = 48
First, divide both sides by 6: 48 ÷ 6 = 8
Now, □ + 2 = 8
Next, subtract 2 from both sides: 8 - 2 = 6
The correct answer is 6.
Key insight: By working backwards and using the correct order, your child can spot what goes in the box. Now they can recognise this type of missing number question and are ready to practise more just like it.
