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The greatest common factor (GCF) is the greatest whole number that evenly _ into two or more numbers.

Find the GCF of 12 and 30.

1. List the factors of both numbers.
2. Circle the common factors
3. Identify the greatest common factor.

12: 1, 2, 3, 4, 6, _
30: 1, 2, 3, _, 6, _, 15, 30
The GCF of 12 and 30 is _.

1 answer

The greatest common factor (GCF) is the greatest whole number that evenly divides into two or more numbers.

Let's find the GCF of 12 and 30.

  1. List the factors of both numbers.

    • Factors of 12: 1, 2, 3, 4, 6, 12
    • Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

  2. Circle the common factors:

    • Common factors: 1, 2, 3, 6

  3. Identify the greatest common factor:

    • The GCF of 12 and 30 is 6.