Fill in the blanks and state the property used.
If a and b are two integers, then their sum is also _______.

Answer

To solve the question, we need to fill in the blank and state the property used regarding the sum of two integers.

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that if \( a \) and \( b \) are two integers, then their sum is also _______. We need to determine what the sum of two integers results in.

2. **Choosing Integers**: Let's choose two integers for our example. For instance, let \( a = 5 \) and \( b = 2 \).

3. **Calculating the Sum**: Now, we calculate the sum of \( a \) and \( b \):
\[ a + b = 5 + 2 = 7 \]

4. **Verifying with Reverse Order**: To ensure that the property holds, we can also calculate \( b + a \):
\[ b + a = 2 + 5 = 7 \]

5. **Conclusion**: Since both \( a + b \) and \( b + a \) yield the same result, we can conclude that the sum of two integers is also an integer. Therefore, we fill in the blank:
\[ \text{If } a \text{ and } b \text{ are two integers, then their sum is also } \text{an integer.} \]

6. **Stating the Property Used**: The property used here is the **Closure Property of Addition** for integers, which states that the sum of any two integers is always an integer.

### Final Answer:
If \( a \) and \( b \) are two integers, then their sum is also **an integer**. The property used is the **Closure Property of Addition**.