Finding Common Factors

Finding Common Factors Worksheet

Read each question carefully and follow the instructions to find the common factors.

List all the factors for each number.

1. Factors of 12:  

2. Factors of 18:  

3. Factors of 24:  

4. Factors of 30:  

Find all the common factors for each pair of numbers.

1. Common factors of 10 and 15:  

2. Common factors of 16 and 24:  

3. Common factors of 20 and 30:  

4. Common factors of 28 and 42:  

Find the Greatest Common Factor (GCF) for each pair of numbers.

1. GCF of 8 and 12:  

2. GCF of 18 and 27:  

3. GCF of 36 and 48:  

4. GCF of 50 and 75:  

1. Which of the following is a common factor of 20 and 25?

2. What is the greatest common factor (GCF) of 14 and 21?

Determine if the following statements are true or false.

1. The common factors of 6 and 9 are 1 and 3.

2. The GCF of 15 and 20 is 10.