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The image asks to find the least common denominator (LCD) of the fractions \( \frac{1}{3} \) and \( \frac{2}{7} \).

### Steps to find the LCD:
1. **Identify the denominators**: The denominators are 3 and 7.
2. **Find the Least Common Multiple (LCM)** of the denominators: 
   - The prime factors of 3 are \(3\).
   - The prime factors of 7 are \(7\).
   - Since 3 and 7 are both prime numbers, the LCM is simply \(3 \times 7 = 21\).

### Answer:
The least common denominator (LCD) of \( \frac{1}{3} \) and \( \frac{2}{7} \) is **21**.

Would you like to go into more detail or have any questions?

Here are 5 related questions that might interest you:
1. How do you find the LCM of more than two numbers?
2. What is the difference between the LCD and LCM?
3. How can you add or subtract fractions with different denominators?
4. What are some methods to find the LCM of larger numbers?
5. Can the LCD ever be smaller than any of the original denominators?

**Tip:** When finding the LCD, always look for the smallest common multiple of all the denominators involved.

Learn how to find the least common denominator (LCD) of the fractions 1/3 and 2/7 using prime factorization and the concept of least common multiple (LCM). This step-by-step solution is suitable for students in Grades 5-7.

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