Prime factorisation using a factor tree
Break a whole number into prime factors.
- Split the number into any useful pair of factors.
- Keep splitting composite factors until every endpoint is prime.
- Multiply all the prime endpoints to check the original number.
Example 1
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Example 2
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Remember
Multiply all the prime endpoints to check the original number.
Your turn
Write as a product of prime factors.
Check answer
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Check answer
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Check answer
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Check answer
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Check answer
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.
Write as a product of prime factors.
Every circled endpoint is prime. Multiply all the endpoints to reconstruct the original number.