Q: What are the prime factors of the number 305,312?

 A: 2, 7, 29, 47

Why are those the prime factors of the number 305,312?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 305,312

305,312
Factor Arrows
2152,656
Factor Arrows
276,328
Factor Arrows
238,164
Factor Arrows
219,082
Factor Arrows
29,541
Factor Arrows
71,363
Factor Arrows
2947

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 7, 29, 47

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 7 x 29 x 47 = 305,312

This can also be written as 25 x 71 x 291 x 471 = 305,312

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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