The process is complete when all of the “circled leaves” at the bottom of the tree are prime numbers. The final answer is found by including all of the factors from the “circled leaves” at the end of ...The process is complete when all of the “circled leaves” at the bottom of the tree are prime numbers. The final answer is found by including all of the factors from the “circled leaves” at the end of each branch of the tree, which yields the same result, namely 24 = 2 · 2 · 2 · 3. This result guarantees that if the prime factors are ordered from smallest to largest, everyone will get the same result when breaking a number into a product of prime factors.