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The question asks for the Greatest Common Factor (GCF) of 25 and 40, with the options being 5, 8, and 10.

To solve this:

- The factors of 25 are: **1, 5, 25**.
- The factors of 40 are: **1, 2, 4, 5, 8, 10, 20, 40**.

The common factors of 25 and 40 are: **1 and 5**.

The greatest of these common factors is **5**.

Therefore, the GCF of 25 and 40 is **5**.

Let me know if you want further details or have any questions!

Here are 5 related questions you might find useful:
1. How do you find the GCF of larger numbers?
2. What is the difference between GCF and LCM (Least Common Multiple)?
3. Can prime factorization be used to find the GCF?
4. How would you find the GCF of three numbers instead of two?
5. What is the GCF of 60 and 45?

**Tip:** When finding the GCF, always break down the numbers into their factors or use prime factorization to identify common factors.

What is the Greatest Common Factor (GCF) of 25 and 40?

Learn how to find the Greatest Common Factor (GCF) of 25 and 40 using prime factorization and common factor methods. Suitable for students in Grades 5-7, this problem helps to reinforce number theory and GCF concepts.

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