## Greatest Common Factor of 30 and 40

GCF(30, 40) = 10, Greatest common factor of 30 and 40 is 10. Greatest Common Factor or Greatest Common Divisor of two numbers is the largest integer by which both the numbers can be divided. There are two different methods to calculate Greatest Common Factor of 30 and 40. Greatest Common Factor by prime factorization method and Greatest Common Factor by matching factors method.

### Greatest Common Factor of 30 and 40 by prime factorization method

We will first find the prime factorization of 30 and 40.
Prime Factorization of 30 is 1, 2, 3, 5 and Prime Factorization of 40 is 1, 2, 2, 2, 5.

• Factorize$$(30) =$$ $$1\times 2\times 3\times 5$$
• Factorize$$(40) =$$ $$1\times 2\times 2\times 2\times 5$$
Now we need to find any which are common for each number (1, 2, 5) and multiply these numbers together.
$$GCF(30, 40) = 1\times 2\times 5 = 10$$.

### Greatest Common Factor of 30 and 40 by matching factors method

List of positive integers factors of 30 leaving a remainder zero is 1, 2, 3, 5, 6, 10, 15, 30
List of positive integers factors of 40 leaving a remainder zero is 1, 2, 4, 5, 8, 10, 20, 40
As you can see, 10 is the greatest and common number that 30 and 40 divides into.
So the greatest common factor 30 and 40 is 10.
$$GCF(30, 40) = 10$$.

Greatest common factor of:
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