The greatest common factor (GCF) of 4 and 8 is 4.

To find the GCF:

1. List the factors of each number:
   • Factors of 4: 1, 2, 4
   • Factors of 8: 1, 2, 4, 8
2. Identify the common factors: 1, 2, 4
3. The greatest common factor is the largest of these, which is 4.

Would you like more details on how to find the GCF, or do you have any other questions?

Here are 5 related questions:

1. What is the GCF of 12 and 18?
2. How do you find the GCF of two numbers using the prime factorization method?
3. What is the GCF of 24 and 36?
4. Can you explain the difference between the GCF and the least common multiple (LCM)?
5. How can the GCF be used to simplify fractions?

Tip: Knowing the GCF is useful in simplifying fractions to their lowest terms.