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The question asks which distance uses the most appropriate units for Janiya's road trip. The options given are:

- \( 3 \times 10^2 \) kilometers
- \( 3 \times 10^5 \) meters
- \( 3 \times 10^7 \) centimeters
- \( 3 \times 10^8 \) millimeters

### Let's convert all the distances to kilometers:

1. **\( 3 \times 10^2 \) kilometers**:  
   Already in kilometers = 300 kilometers.

2. **\( 3 \times 10^5 \) meters**:  
   \( 1 \) kilometer = \( 10^3 \) meters, so:
   \[
   3 \times 10^5 \, \text{meters} = \frac{3 \times 10^5}{10^3} = 300 \, \text{kilometers}
   \]

3. **\( 3 \times 10^7 \) centimeters**:  
   \( 1 \) kilometer = \( 10^5 \) centimeters, so:
   \[
   3 \times 10^7 \, \text{centimeters} = \frac{3 \times 10^7}{10^5} = 300 \, \text{kilometers}
   \]

4. **\( 3 \times 10^8 \) millimeters**:  
   \( 1 \) kilometer = \( 10^6 \) millimeters, so:
   \[
   3 \times 10^8 \, \text{millimeters} = \frac{3 \times 10^8}{10^6} = 300 \, \text{kilometers}
   \]

### Most appropriate unit:
For road trips, distances are most commonly measured in **kilometers** (or miles, depending on the country). Using kilometers is more practical and convenient compared to meters, centimeters, or millimeters, which are typically used for shorter distances.

Thus, the most appropriate unit for this road trip is **\( 3 \times 10^2 \) kilometers**.

Would you like more details or have any questions?

Here are 5 related questions for practice:
1. Convert 500 kilometers to meters.
2. How many millimeters are in 1 kilometer?
3. What is the conversion factor between centimeters and kilometers?
4. If a road trip is 250,000 meters, what is this distance in kilometers?
5. When would it be more appropriate to use meters instead of kilometers for distance?

**Tip:** Always use units that are practical and easy to interpret based on the situation. For long trips, kilometers or miles are more suitable than smaller units like meters or centimeters.

Janiya is taking a road trip. The distance she plans to travel can be written as 3 × 10^2 kilometers, 3 × 10^5 meters, 3 × 10^7 centimeters, or 3 × 10^8 millimeters. Which distance uses the most appropriate units?

Learn how to select the most appropriate units for measuring distance, focusing on converting kilometers, meters, centimeters, and millimeters. Understand the practicality of different units in real-world situations, like road trips. Suitable for students in Grades 6-8.

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