Mathematics·Multiplication & Division·conceptual
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
Suggested ages 9–10
Learning journey
Your child is mastering more complex multiplication and division — working with larger numbers, understanding factors and multiples, solving multi-step problems, and beginning to use formal written methods.
Evidence of 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
Assessment prompt
Can Prime numbers 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?
Standards alignment
No external standards are linked to this topic.