Ages 12–13
BrainteenAges 13–14MathsWorksheet
Averages and spread: quartiles, IQR and standard deviation (KS3 · Year 9)
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Use the data and the charts to answer. Round only where the question says so.
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About this activity
What your child practises
Quick, accurate calculation and recall of number facts, building the fluency harder maths depends on.
What’s included
- 10 questions
- An answer key you can print with the sheet or on its own
- An on-screen version with instant marking and stars
Age and school year
Made for ages 13–14. That’s Grade 8–9 in the US, Year 9–10 in England, JSS 2–3 in Nigeria and Class 8–9 in India.
How to use it
- Print it at home or school – it fits a standard A4 or US Letter page.
- Print the answer key too, so marking takes seconds.
- Play it on screen: answers are marked instantly and children earn stars.
- Write on it on a tablet or touchscreen with a finger or stylus – no printer needed.
Tips for parents and teachers
- If a question goes wrong, ask your child to show it with fingers, objects or a quick sketch, then try again.
- Let your child mark the sheet with the answer key; spotting their own mistakes is a skill in itself.
- Treat mistakes as information: note what went wrong next to each incorrect answer.
Good to know
- Time needed
- About 15–25 minutes
- You’ll need
- A printer (or a tablet to work on screen), a pencil and an eraser
- Difficulty
- On level (KS3 · Year 9) – pitched at ages 13–14
- Answer key
- Yes – print it with the sheet or on its own