11+ Maths: Using Inverse Operations to Check Answers
21 October 2026
How inverse operations help in 11+ maths
Inverse operations are simply pairs of actions that undo each other. Addition and subtraction are a pair. Multiplication and division are another. Using these pairs, your child can double-check their answers in 11+ maths with confidence.
Why check with the inverse
When your child solves a problem, it is easy to make a small mistake. Checking with an inverse operation is a quick way to spot errors before they become habits. It helps build accuracy and trust in their own working.
Step-by-step example
Let's check an addition answer using the inverse operation (subtraction):
Step 1: Original sum 15 + 8 = 23
Step 2: Use the inverse (subtraction) 23 - 8 = 15
Step 3: Compare with the original number
The answer matches the starting number, so the calculation is correct.
Putting it into practice
Encourage your child to use this method for addition, subtraction, multiplication and division. If their answer stands up to the inverse check, they can move on with confidence. If not, it is a signal to look for a slip.
Key insight: Checking answers with inverse operations helps children catch mistakes early and builds confidence in their maths skills.
