Fill in the blanks and write the property used in each of the following.
`99 times (-88)="_______" times 99`

Answer

To solve the problem, we need to fill in the blank in the expression `99 times (-88) = "_______" times 99` and identify the property used.

### Step-by-Step Solution:

1. **Identify the Expression**: We start with the expression `99 times (-88)`. This can be written mathematically as \( 99 \times (-88) \).

2. **Use the Commutative Property of Multiplication**: The commutative property states that the order of multiplication does not affect the product. This means that \( a \times b = b \times a \).

3. **Apply the Property**: In our case, we can switch the order of multiplication:
\[ 99 \times (-88) = (-88) \times 99 \]

4. **Fill in the Blank**: Therefore, the blank can be filled with `-88`. So, we have:
\[ 99 \times (-88) = -88 \times 99 \]

5. **Write the Final Answer**: The complete statement is:
\[ 99 \times (-88) = -88 \times 99 \]

6. **Identify the Property Used**: The property used here is the **Commutative Property of Multiplication**.

### Final Answer:
- The filled blank is: `-88`
- The property used is: **Commutative Property of Multiplication**