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Let's solve each subtraction problem step-by-step:

### 1. **\( \frac{9}{10} - \frac{1}{2} \)**
   - Find a common denominator. The least common denominator (LCD) for 10 and 2 is 10.
   - Convert \( \frac{1}{2} \) to a fraction with denominator 10: 
     \[ \frac{1}{2} = \frac{5}{10} \]
   - Now, perform the subtraction: 
     \[ \frac{9}{10} - \frac{5}{10} = \frac{4}{10} \]
   - Simplify \( \frac{4}{10} \) by dividing the numerator and denominator by 2: 
     \[ \frac{4}{10} = \frac{2}{5} \]
   - **Answer:** \( \frac{2}{5} \)

### 2. **\( \frac{5}{8} - \frac{2}{4} \)**
   - Find a common denominator. The LCD for 8 and 4 is 8.
   - Convert \( \frac{2}{4} \) to a fraction with denominator 8:
     \[ \frac{2}{4} = \frac{4}{8} \]
   - Now, perform the subtraction:
     \[ \frac{5}{8} - \frac{4}{8} = \frac{1}{8} \]
   - **Answer:** \( \frac{1}{8} \)

So, the final answers are:

1. \( \frac{9}{10} - \frac{1}{2} = \frac{2}{5} \)
2. \( \frac{5}{8} - \frac{2}{4} = \frac{1}{8} \)

Would you like more details or have any questions?

Here are some related questions:

1. How do you find the least common denominator for any two fractions?
2. What steps are involved in simplifying a fraction?
3. How do you convert improper fractions to mixed numbers?
4. How can you add or subtract fractions with different denominators?
5. What is the difference between proper and improper fractions?

**Tip:** Always check if the result can be simplified after performing fraction operations!

9/10 - 1/2 and 5/8 - 2/4. Subtract and simplify if possible.

Learn how to subtract fractions like 9/10 - 1/2 and 5/8 - 2/4, including finding the least common denominator and simplifying the results. Perfect for students in Grades 4-6.

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