Method 1:
List the factors of each number.
Factors of 18: 2, 3, 6, 9, 18
Factors of 33: 3, 11, ,33
Identify the greatest common factor.
The greatest common factor of 18 and 33 is 3.
Method 2:
Write the prime factorization of each number.
18 = 2 × 3 × 3.
33 = 3 × 11.
The GCF is the product of the common prime factors in each number.
GCF = 3.
The greatest common factor of 18 and 33 is 3.
The greatest common factor of 18 and 33 is 3.
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