GCF of 30 and 45

How to find the GCF of 30 and 45.
I like to use a factor to find the GCF of 45 and 30.
The GCF is the largest number that divides evenly into two or more numbers.
After finding the prime numbers you just multiply the pairs of prime numbers.

30 = 2 3 5
45 =    3 5 3

Multiply the pairs of prime numbers.

3 x 5 = 15
The GCF of 30 and 45 = 15

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