To solve $-\frac{3}{8} + \frac{1}{4} - \frac{1}{2}$, we can first express all fractions with a common denominator. The least common denominator for $8$, $4$, and $2$ is $8$.

1. Rewrite each fraction with a denominator of $8$:

   • $-\frac{3}{8}$ stays as $-\frac{3}{8}$.
   • $\frac{1}{4} = \frac{2}{8}$.
   • $\frac{1}{2} = \frac{4}{8}$.

2. Substitute and add: $-\frac{3}{8} + \frac{2}{8} - \frac{4}{8} = \frac{-3 + 2 - 4}{8} = \frac{-5}{8}$

So, the answer is: $-\frac{5}{8}$

Would you like more details or have any questions?

Here are five related questions:

1. What is the method for finding a common denominator between different fractions?
2. How can we simplify fractions after adding or subtracting them?
3. How do we handle mixed numbers in addition or subtraction?
4. How can we convert improper fractions to mixed numbers?
5. What are some common mistakes to watch for when adding and subtracting fractions?

Tip: Always simplify fractions after any operation to ensure your answer is in its simplest form.