Equations and Missing Numbers for 11+ Maths
21 October 2026
Why practise equations and missing numbers
Understanding equations and missing numbers is a key part of 11+ maths. These questions help children develop logical thinking and the ability to solve problems step by step.
Regular practice builds confidence, making algebra less intimidating and more approachable.
What your child needs to know
In 11+ exams, children may be asked to find the missing number in a simple equation. They need to understand that the equals sign means both sides must have the same value. This idea of balance is at the heart of solving equations.
Worked example
2x + 4 = 10
Step 1: Subtract 4 from both sides to get the term with x on its own.
2x + 4 - 4 = 10 - 4
This simplifies to:
2x = 6
Step 2: Divide both sides by 2 to find x.
2x ÷ 2 = 6 ÷ 2
So:
x = 3
The answer is x = 3.
Key insight: Always do the same operation to both sides of the equation. This keeps everything balanced and leads to the correct answer.
Building confidence through practice
Encourage your child to work through equations and missing number questions regularly. Practising together helps them see patterns, spot mistakes, and feel more prepared for the 11+ exam.
