To solve the expression \( \frac{3}{8} + \frac{2}{5} \), we need to add the two fractions. Here's the process:

1. **Find a common denominator**:
   The denominators are 8 and 5. The least common denominator (LCD) is 40.

2. **Convert each fraction**:
   \[
   \frac{3}{8} = \frac{3 \times 5}{8 \times 5} = \frac{15}{40}
   \]
   \[
   \frac{2}{5} = \frac{2 \times 8}{5 \times 8} = \frac{16}{40}
   \]

3. **Add the numerators**:
   \[
   \frac{15}{40} + \frac{16}{40} = \frac{15 + 16}{40} = \frac{31}{40}
   \]

Thus, \( \frac{3}{8} + \frac{2}{5} = \frac{31}{40} \).

Would you like more details or have any questions?

Here are 5 related questions:
1. How do you subtract fractions with different denominators?
2. What is the least common denominator, and how do you find it?
3. Can you convert \( \frac{31}{40} \) to a decimal?
4. How do you multiply or divide fractions?
5. What is the process for simplifying fractions?

**Tip**: Always simplify your answer if possible, but in this case, \( \frac{31}{40} \) is already in its simplest form.

Learn how to add fractions like 3/8 + 2/5 using the least common denominator (LCD). This step-by-step solution covers key concepts in fraction addition and is suitable for students in Grades 5-7.

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