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Let's go through the questions visible in the image and provide the correct answers with explanations:

### 1. **What is a unit fraction?**
   The question asks about a unit fraction. 
   - **Correct Answer: B** (A fraction that has a numerator of 1)

   **Explanation:** A unit fraction is a fraction where the numerator is 1, such as \( \frac{1}{2}, \frac{1}{3}, \frac{1}{4} \), etc.

### 2. **A meter stick is cut into smaller pieces. How many equal pieces are in the meter stick?**
   The question asks for the number of pieces.
   - **Correct Answer: B** (4)

   **Explanation:** If a meter stick (which is 100 cm) is divided into smaller pieces, and we assume each piece is 25 cm, then 100 cm / 25 cm = 4 pieces.

### 3. **There are ____ cm in 2.54 km.**
   The question asks to convert kilometers to centimeters.
   - **Correct Answer: D** (254000)

   **Explanation:** \( 1 \text{ km} = 1000 \text{ m} \), and \( 1 \text{ m} = 100 \text{ cm} \). Therefore, \( 2.54 \text{ km} = 2.54 \times 1000 \times 100 = 254000 \text{ cm}. \)

### 4. **All of the statements below are true except:**
   The question asks which statement is false.
   - **Correct Answer: D** (All whole numbers are positive integers)

   **Explanation:** Whole numbers include 0, and 0 is not a positive integer. Therefore, the statement "All whole numbers are positive integers" is false.

### 5. **How many forty thousand are there in one million?**
   - **Correct Answer: C** (25)

   **Explanation:** \( 1,000,000 \div 40,000 = 25 \). So, there are 25 forty-thousands in one million.

### 6. **Carlo cycled for 8 miles. What is the equivalent of this distance in kilometers?**
   The question asks to convert 8 miles to kilometers.
   - **Correct Answer: C** (12.9 km)

   **Explanation:** The conversion factor from miles to kilometers is approximately 1 mile = 1.609 km. Thus, \( 8 \text{ miles} \times 1.609 \text{ km/mile} = 12.872 \text{ km} \approx 12.9 \text{ km}. \)

### 7. **A swimmer weighs 122 lbs. What is his weight in kg?**
   The question asks to convert pounds to kilograms.
   - **Correct Answer: A** (55.3 kg)

   **Explanation:** The conversion factor from pounds to kilograms is \( 1 \text{ lb} \approx 0.4536 \text{ kg} \). Therefore, \( 122 \text{ lbs} \times 0.4536 = 55.3392 \text{ kg} \approx 55.3 \text{ kg}. \)

If you would like any more details or explanations, feel free to ask!

### Additional questions:
1. How do you convert kilometers to meters and meters to centimeters?
2. Why is 0 not considered a positive integer?
3. How is the Greatest Common Factor (GCF) related to coprime numbers?
4. Can a whole number be a negative number? Explain.
5. How can you use fractions in real-world scenarios like dividing objects?

**Tip:** When converting units, always check the conversion factor and multiply carefully to ensure the correct units in your answer.

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Explore a variety of math problems including unit fractions, kilometer to centimeter conversions, number theory concepts like coprime numbers, and converting weights and distances. Suitable for students in Grades 6-8.

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