The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30.
The prime factors are 2, 3 and 5.
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13 is a prime factor of itself Prime factors of 30 are: 2, 3 and 5
The prime factors of 30 are: 2 + 3 + 5 = 10
The longest string of prime factors for 30 is 2 x 3 x 5 because there isn't a prime factor string that's longer.
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. Some numbers have some of the same prime factors as other numbers. These are known as common prime factors. 3 is a common prime factor of 12 and 15.