Ages 13–14
BrainteenAges 13–14ScienceWorksheet
Magnification and microscopy calculations (KS3 · Year 9)
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Show your working and give units. Magnification = image size ÷ actual size (both in the same unit: 1 mm = 1000 µm, 1 µm = 1000 nm). Where an answer is not exact, round it as the question says.
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About this activity
What your child practises
Practising key skills with a ready-to-use activity.
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
- Do it on screen first for instant marking, then print it a few days later to see what was remembered.
- Sort answers into “know it” and “still learning”, and revisit only the second pile next time.
- 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