Fill in the blanks:
1 km=_____cm

Answer

To solve the question "1 km = _____ cm", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion**: We know that 1 kilometer (km) is equal to 1000 meters (m).
- **Hint**: Remember the basic metric conversions: 1 km = 1000 m.

2. **Convert Meters to Centimeters**: We also know that 1 meter is equal to 100 centimeters (cm).
- **Hint**: Recall that 1 m = 100 cm.

3. **Combine the Conversions**: To find out how many centimeters are in 1 kilometer, we need to multiply the number of meters in a kilometer by the number of centimeters in a meter.
- **Calculation**:
\[ 1 \text{ km} = 1000 \text{ m} \times 100 \text{ cm/m} \]

4. **Perform the Multiplication**:
\[ 1000 \times 100 = 100000 \]
So, 1 kilometer is equal to 100,000 centimeters.

5. **Final Answer**: Therefore, we can fill in the blank:
\[ 1 \text{ km} = 100000 \text{ cm} \]

### Final Answer:
1 km = 100000 cm