Prime factorisation

Writing a number as primes multiplied together, like 60 = 2 × 2 × 3 × 5 - the one recipe every whole number bigger than 1 has.

Depth 1 · Foundation

You can grow a factor tree until every branch ends in a prime, and write a number as a product of primes.

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Depths of understanding

1
Foundation
You can grow a factor tree until every branch ends in a prime, and write a number as a product of primes.
Opens after
Prime numbersA factor tree stops at the primes, so you need to tell a prime when you see one.
2
Deeper
You know every number has exactly one prime recipe whatever tree you draw, can read factors off it, and can say why 1 is kept out of the primes.
Master depth 1 first
3
Connected
You see why multiplying two big primes is easy but finding them again from the product is very hard, and how that keeps messages safe.
Master depth 2 first

Your path here

What's still between you and Prime factorisation, depth 1, in the order you can learn it.

Builds on

Prime numbersA factor tree stops at the primes, so you need to tell a prime when you see one.

Opens up

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