The Greatest Common Factor (GCF) of 18 and 54 is **18**. 

### Steps:
1. Find the factors of each number:
   - Factors of 18: 1, 2, 3, 6, 9, 18
   - Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54
2. Identify the common factors: 1, 2, 3, 6, 9, 18
3. The greatest common factor is 18.

Would you like more details or have any questions about this?

Here are some related questions:
1. What is the Least Common Multiple (LCM) of 18 and 54?
2. How do you find the GCF of three numbers?
3. How does prime factorization help in finding the GCF?
4. How is the GCF used in simplifying fractions?
5. What is the GCF of 54, 18, and 72?

**Tip:** The GCF is useful in reducing fractions to their simplest form.

Find the Greatest Common Factor (GCF) of 18 and 54 with this simple step-by-step solution. Explore factors, common factors, and the GCF using number theory. Perfect for students in Grades 4-6 learning about GCF.

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