Q: What are the prime factors of the number 135,960?

 A: 2, 3, 5, 11, 103

Why are those the prime factors of the number 135,960?

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 135,960

135,960
Factor Arrows
267,980
Factor Arrows
233,990
Factor Arrows
216,995
Factor Arrows
35,665
Factor Arrows
51,133
Factor Arrows
11103

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, 103

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 5 x 11 x 103 = 135,960

This can also be written as 23 x 31 x 51 x 111 x 1031 = 135,960

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


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