Q: What are the prime factors of the number 285,120?

 A: 2, 3, 5, 11

Why are those the prime factors of the number 285,120?

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 285,120

285,120
Factor Arrows
2142,560
Factor Arrows
271,280
Factor Arrows
235,640
Factor Arrows
217,820
Factor Arrows
28,910
Factor Arrows
24,455
Factor Arrows
31,485
Factor Arrows
3495
Factor Arrows
3165
Factor Arrows
355
Factor Arrows
511

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, 3, 5, 11

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 3 x 3 x 5 x 11 = 285,120

This can also be written as 26 x 34 x 51 x 111 = 285,120

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


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