The question asks which statement about the number 10 is true:

1. 10 is a multiple of 4: This is false because $10 \div 4 = 2.5$, which is not an integer.

2. 10 is a multiple of 5: This is true because $10 \div 5 = 2$, which is an integer.

3. 10 is a multiple of 20: This is false because $10 \div 20 = 0.5$, which is not an integer.

4. 10 is a multiple of 25: This is false because $10 \div 25 = 0.4$, which is not an integer.

Correct Answer:

10 is a multiple of 5.

Let me know if you'd like further clarification! Here are 5 follow-up questions to explore:

1. What is the definition of a multiple in mathematics?
2. How do you test if one number is a multiple of another?
3. Can a smaller number be a multiple of a larger number?
4. What are all the multiples of 10 up to 100?
5. How does the concept of factors relate to multiples?

Tip: A number is a multiple of another if the division results in an integer.