Ages 14–16
BrainteenAges 14–16ScienceWorksheet
Relative formula mass and percentage by mass (GCSE-style Foundation)
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Show your working and give units. Use the relative atomic masses (Ar) given in each question. Where an answer is not exact, round it to the number of significant figures or decimal places the question asks for.
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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 14–16. That’s Grade 9–11 in the US, Year 10–12 in England, JSS 3 – SS 2 in Nigeria and Class 9–11 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
- Little and often wins: five minutes a day beats one long session a week.
- Say new words out loud and use each one in a sentence – hearing and using words is how they stick.
- 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
- Harder (GCSE-style Foundation) – pitched at ages 14–16
- Answer key
- Yes – print it with the sheet or on its own