Fill in the blanks
`45 m = "____________"km`

Answer

To convert 45 meters into kilometers, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factor**:
We know that 1 kilometer (km) is equal to 1000 meters (m).

2. **Set Up the Conversion**:
We want to convert 45 meters into kilometers. We can express this as:
\[ 45 \text{ m} = x \text{ km} \]

3. **Use the Conversion Factor**:
Since 1 km = 1000 m, we can express 1 m in terms of kilometers:
\[ 1 \text{ m} = \frac{1}{1000} \text{ km} \]

4. **Multiply by the Conversion Factor**:
To convert 45 meters to kilometers, we multiply by the conversion factor:
\[ 45 \text{ m} = 45 \times \frac{1}{1000} \text{ km} \]

5. **Calculate the Result**:
Now, perform the multiplication:
\[ 45 \times \frac{1}{1000} = \frac{45}{1000} \text{ km} \]

6. **Convert to Decimal**:
To convert \(\frac{45}{1000}\) into decimal form, we can divide 45 by 1000:
\[ \frac{45}{1000} = 0.045 \text{ km} \]

7. **Final Answer**:
Therefore, we can fill in the blank:
\[ 45 \text{ m} = 0.045 \text{ km} \]