Check an answer
- Estimate first.
- Use an inverse operation.
- Ask whether the answer size is sensible.
Answer: Check 9 × 8 = 72 with 72 ÷ 8 = 9
🔢 Number
Checking answers
Learn checking answers with a GCSE-style explanation, help guide, worked example, practice question and flashcards.
Global XP
Level 10 / 100 XP
1. Explanation
Key idea
- Checking answers is part of number and appears often in KS3–GCSE maths.
- Checking answers catches mistakes before you finish.
- Use the worked model, help guide, interactive question and flashcards to practise checking answers until the steps feel automatic.
Real-life examples
- Shopping, sport, travel, science, design and everyday decisions all use this skill.
2. Visual
Checking answers learning map
Understand the key idea → follow the help guide → practise a question → check your method → build speed with flashcards.
3. Help guide
How to tackle Checking answers
- Learn the rule: Checking answers catches mistakes before you finish.
- Worked model: Estimate first. Use an inverse operation. Ask whether the answer size is sensible.
- Try the interactive question without looking at the answer first.
- Use the flashcards to test the rule, the method and a common check.
4. Worked examples
Step-by-step working
5. Interactive questions
Try it yourself
What inverse check can you use for 37 + 25 = 62?
6. Flashcards
Master quick recall
Flip each card, then choose whether you know it or need more practice.
0 mastered
FrontRule for Checking answers
BackChecking answers catches mistakes before you finish.
FrontExample answer: What inverse check can you use for 37 + 25 = 62?
BackSubtracting 25 from 62 gives 37, so the addition is checked.
FrontCommon check for Checking answers
BackCheck units/notation, compare with an estimate, and make sure the answer matches the question.
7. Finish
Complete this topic
When you have read the examples, tried the question and reviewed flashcards, claim your topic completion XP.