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Q:A:### Quick Answer

**The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30.** A number is considered the factor of another number when it can be evenly divided into that number.

If the only factors for a number are 1 and the number itself, it is considered a prime number. Common factors between two numbers are any factors shared by both of those numbers. The greatest common factor is the biggest of those common factors. There are multiple ways to find the greatest common factor, one of which is to list all the factors of both numbers. Another method is finding the shared prime number factors and multiplying them together. The greatest common factor is useful for simplifying fractions, because dividing the numerator and the denominator by the greatest common factor simplifies the fraction as low as possible.

Numbers can be broken down into prime number factors through prime factorization, also known as integer factorization. This is done by continually breaking down a number into smaller factors until the only factors left are prime numbers. Prime factorization can be very difficult and complex for larger numbers, and no method is known to complete long factorizations quickly as of 2014.

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## What are the factors of 21?

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Full Answer >**The factors of 21 are 1, 3, 7 and 21.**A factor is a number that can divide evenly into a given number. Because 21 can be divided by numbers other than itself and 1, it is called a composite number.Filed Under: - Q:
## What are the factors of 49?

A:The factors of 49 are 1, 7 and 49. The factors of a given number are those numbers that divide into it evenly leaving no remainder. One and the number itself, 49 in this case, are always factors.

Full Answer >Filed Under: - Q:
## What are the factors of 72?

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Full Answer >**The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.**Factors are the numbers that can be multiplied together to get 72.Filed Under: - Q:
## What are the factors of 26?

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Full Answer >**The factors of 26 are one, two, 13 and 26.**One and the number itself, in this case 26, are always factors. Since 26 is an even number, which means that it ends in zero, two, four, six or eight, it's evenly divisible by two. Two times 13 equals 26.Filed Under: