Find the greatest common divisor of 66 and 30 . The greatest common divisor of 66 and 30 is

Step 1 ：Define the problem: Find the greatest common divisor of 66 and 30.

Step 2 ：The greatest common divisor (GCD) of two or more integers is the largest positive integer that divides the numbers without a remainder. For example, the GCD of 8 and 12 is 4.

Step 3 ：Let's find the GCD of 66 and 30.

Step 4 ：By calculation, we find that the GCD of 66 and 30 is 6.

Step 5 ：Final Answer: The greatest common divisor of 66 and 30 is \(\boxed{6}\).