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
Share and support
Teaching Table
Set out your lesson
Distinguish primes from composites using complete factor tests, then retrieve small primes without a displayed list.
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.
Two sheets or one folded sheet; put the teaching list away before recall. Avoid a numbered row of blanks that reveals how many primes are wanted.
Record actual responses, assistance and access mode; never invent observations or infer mastery.
Use the complete materials on screen or print only the current sheet. Keep adult guidance out of learner view. Retain an earlier model only when the current step supplies it as context.
Teaching limits and safe use
These are finite task opportunities, not proof of mastery. Record what was attempted and what support was used.
Fresh classification and rehearsed list retrieval are separate. A small sample does not show classification of every number up to 100.
Record actual responses, assistance and access mode; never invent observations or infer mastery.
Family records and proof options
Keep a record of your learning
Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.
Learning resources
Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.
No reviewed resources for this concept yet.
The teaching approach above still stands. Curated practice links will appear here as the shelf fills.
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 9–10