Measure spread
- Find the highest value.
- Find the lowest value.
- Subtract lowest from highest.
Answer: Range of 3, 5, 11 is 8
📊 Statistics
Interquartile range
Learn interquartile range with a GCSE-style explanation, help guide, worked example, practice question and flashcards.
Global XP
Level 10 / 100 XP
1. Explanation
Key idea
- Interquartile range is part of statistics and appears often in KS3–GCSE maths.
- Spread describes how varied the data is.
- Use the worked model, help guide, interactive question and flashcards to practise interquartile range until the steps feel automatic.
Real-life examples
- Shopping, sport, travel, science, design and everyday decisions all use this skill.
2. Visual
Interquartile range 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 Interquartile range
- Learn the rule: Spread describes how varied the data is.
- Worked model: Find the highest value. Find the lowest value. Subtract lowest from highest.
- 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
Find the range of 4, 9, 10, 12.
6. Flashcards
Master quick recall
Flip each card, then choose whether you know it or need more practice.
0 mastered
FrontRule for Interquartile range
BackSpread describes how varied the data is.
FrontExample answer: Find the range of 4, 9, 10, 12.
Back12 - 4 = 8.
FrontCommon check for Interquartile range
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.