Why Do All Factors of a Number Arise from Combinations of Its Prime Factors?

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Discussion Overview

The discussion revolves around the question of why multiplying different combinations of prime factors of a number results in all of that number's factors. The scope includes conceptual understanding of prime factorization and its implications for finding factors of composite numbers.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant explains that every composite number can be factored into products of prime numbers, suggesting that combinations of these prime factors yield composite factors of the original number.
  • Another participant reiterates the need for an explanation of why multiplying combinations of prime factors results in all composite factors, emphasizing the inquiry into the underlying reasoning.
  • A different participant provides a visual demonstration of the prime factorization process, illustrating that any composite factor can be broken down into its prime factors, which are part of the original number's prime factor list.
  • This participant argues that since the list of prime factors remains consistent regardless of the composite factors chosen, any combination of these prime factors will produce any given composite factor.

Areas of Agreement / Disagreement

Participants express a shared understanding of the relationship between prime factors and composite factors, but there remains a lack of consensus on the deeper reasoning behind why this relationship holds true.

Contextual Notes

The discussion does not resolve the underlying question of why combinations of prime factors yield all factors of a number, leaving the reasoning open to further exploration.

jman115
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When I teach GCF to students, I show them how to find via the prime factorization and explain to them how the PF can get you all the factors of a number by multiplying different combinations of the Prime Factors and then proceed to explain why they are supposed to multiply the common Prime factors for the gcf.
My question is, why does multiplying different combinations of the prime factors get you ALL of the number's factors?
 
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jman115 said:
When I teach GCF to students, I show them how to find via the prime factorization and explain to them how the PF can get you all the factors of a number by multiplying different combinations of the Prime Factors and then proceed to explain why they are supposed to multiply the common Prime factors for the gcf.
My question is, why does multiplying different combinations of the prime factors get you ALL of the number's factors?

Hi jman115,

I know you know this already, but every composite number can be factored into the products of only prime numbers. Any combination of products with these prime factors will yield a composite factor of the original number.

Don't know if that's answers your question. Hope so.
 
"Any combination of products with these prime factors will yield a composite factor of the original number." I stated this fact in my opening thread.

I am asking why this works. When you multiply all combinations of the prime factors you get all the composite factors of that number. I want to know why this works.
 
This is a nice visual demonstration from Wikipedia of the prime factorization process. Any composite factor of the original number will be broken down into its own product prime factors, which are part of the original number's prime factor list.

View attachment 31

Take a number like 64. This could be broken down into 32*2 or 16*4, then repeated until you have only the prime factors. No matter which way you break down a number into composite factors then into prime factors, the end result will be the same list of prime factors. Because the list of prime factors is the same no matter which composite factors you start with, some combination of prime factors multiplied together will also produce any given composite factor.
 

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