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To solve this question, we need to find the most useful step for subtracting the two fractions: 

\[
\frac{15}{8} - \frac{5}{4}
\]

The key to subtracting fractions is to find a **common denominator**. In this case, the denominators are 8 and 4. The most useful step would be to find the **least common multiple (LCM)** of 4 and 8, which is the smallest number both denominators divide evenly into.

### Explanation:
- The **LCM of 4 and 8** is 8.
- After finding the LCM, convert both fractions to have the same denominator:
  - \(\frac{5}{4}\) can be rewritten as \(\frac{10}{8}\).
  - Now the subtraction becomes \(\frac{15}{8} - \frac{10}{8} = \frac{5}{8}\).

Therefore, the most useful step is to **find the least common multiple of 4 and 8**.

The correct answer is:
- **Find the least common multiple of 4 and 8**.

Would you like further explanation or details on this topic?

Here are 5 related questions for practice:
1. How do you find the least common multiple of two numbers?
2. What is the difference between the greatest common factor and the least common multiple?
3. How do you subtract fractions with different denominators?
4. What is the least common multiple of 6 and 9?
5. Why is finding a common denominator important for adding or subtracting fractions?

**Tip:** When subtracting fractions, always find the least common denominator to simplify the process.

To determine how much her plant grew, Leisha subtracted 5/4 inches from 15/8 inches. Which step is most useful to perform the subtraction?

Learn how to subtract fractions with different denominators by finding the least common multiple (LCM) of the denominators. This problem involves subtracting 5/4 inches from 15/8 inches and uses key fraction concepts suitable for Grades 5-7.

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