Prime numbers
Know and use the vocabulary of prime numbers, prime factors, and composite numbers; establish whether a number up to 100 is prime; recall prime numbers up to 19
Lesson
Set out your lesson
Distinguish primes from composites using complete factor tests, then retrieve small primes without a displayed list.
Before teaching
Use this short check, then start teaching.
Ask for factor pairs of 10 and 12. Offer multiplication support during Guided, but record it. Also ask what a square number means and check 5 × 5 and 6 × 6. If square roots are unfamiliar, use the factor-pair explanation below; record the extra teaching before independent work.
Check learner readiness separately; the existence of a prerequisite lesson is not evidence of attainment.
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Distinguish primes from composites using complete factor tests, then retrieve small primes without a displayed list.
Distinguish primes from composites using complete factor tests, then retrieve small primes without a displayed list.
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Learning resources
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BBC Bitesize · Practice link — not the full lesson
KS3 Maths
Before you open · source notes
KS3 Maths supports Prime numbers. An adult previews and guides; this is a learning page, not a scored quiz.
Free educational page, no sign-in required for the tested path.
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Source, access and review notes
Public BBC Bitesize page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
BBC Bitesize. “KS3 Maths.” External page; Gakuva does not copy, host, embed, or redistribute materials.
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Check understanding
- Explain that a prime number has exactly two factors: 1 and itself
- Determine whether 51 is prime or composite and justify the answer
- List all prime numbers up to 19 from memory
“Can your child tell you what makes a number 'prime' — that it only divides exactly by 1 and itself — and give some examples like 7, 11, and 13?”
Curriculum record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Multiplication & Division
- Age range
- Ages 9–12
Standards