Ages 13–18
BrainteenAges 12–18MathsWorksheet
Prime numbers (Core) · Practice set 1
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A prime number has exactly two factors: 1 and itself. Answer each question.
Curriculum links
- Common Core 4.OA.B.4: Find factor pairs for whole numbers up to 100, recognise multiples, and decide whether a number is prime or composite.
- England NC Y5.MA.MD.2: Know the vocabulary of prime numbers, prime factors and composite numbers, and say whether a number up to 100 is prime.
- England NC KS3.MA.NUM.3: Use prime numbers, factors, multiples, highest common factor, lowest common multiple and prime factorisation.
- BNCC EF06MA05: Classify numbers as prime or composite, use "multiple of", "divisor of" and "factor of", and find divisibility rules.
- Programmes FR C4.MA.NC.3: Use multiples, divisors and prime numbers; decompose a number into prime factors.
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About this activity
What your child practises
Skills: Prime numbers (level 2).
Applying a method step by step and checking the answer – the skills secondary-school maths tests are built on.
What’s included
- 15 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 12–18. That’s Grade 7–12 in the US, Year 8–13 in England, JSS 1 – SS 3 in Nigeria and Class 7–12 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
- Check answers after each block of questions so a misconception is caught before it is practised.
- Ask for the working, not just the answer – in exams, clear method earns marks even when the answer slips.
- Use a fresh printed copy as a short timed test before an exam to practise working under pressure.
Good to know
- Time needed
- About 20–30 minutes
- You’ll need
- A printer (or a tablet to work on screen), a pencil and an eraser
- Difficulty
- On level (Core) – pitched at ages 12–18
- Answer key
- Yes – print it with the sheet or on its own