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The image shows a math problem asking to use the unit fraction \( \frac{1}{5} \) to represent the space between tick marks on a number line, and then find the difference represented.

### Step-by-Step Breakdown:

1. **Understanding the Number Line:**
   - The tick marks on the number line are spaced apart by \( \frac{1}{5} \). 
   - There are two arrows, one blue and one red, showing different values on the number line.

2. **Identifying the Numbers:**
   - The blue arrow appears to start at \( 0 \) and ends at \( 1 \), which spans the entire unit from \( 0 \) to \( 1 \). This represents \( 1 \).
   - The red arrow appears to start at \( \frac{2}{5} \) and ends at \( \frac{4}{5} \). This represents a subtraction or difference of \( \frac{4}{5} - \frac{2}{5} \).

3. **Expression Involving Subtraction:**
   - Based on the number line, the subtraction being modeled by the red arrow is:
     \[
     \frac{4}{5} - \frac{2}{5}
     \]

4. **Finding the Difference:**
   - Since both fractions have the same denominator, subtract the numerators:
     \[
     \frac{4}{5} - \frac{2}{5} = \frac{4 - 2}{5} = \frac{2}{5}
     \]

Thus, the expression is \( \frac{4}{5} - \frac{2}{5} \) and the difference is \( \frac{2}{5} \).

Would you like more details on any step? 

Here are 5 related questions to expand on this:
1. What is a unit fraction and why is \( \frac{1}{5} \) considered a unit fraction?
2. How can we visualize different fractions on a number line?
3. How would you represent addition of fractions on the same number line?
4. What happens when the fractions you subtract have different denominators?
5. Can you express the result \( \frac{2}{5} \) as a decimal or percentage?

**Tip:** When subtracting fractions, always ensure they have a common denominator to make the subtraction easier!

Learn how to subtract fractions on a number line with tick marks spaced by 1/5. This step-by-step solution models the subtraction of 4/5 - 2/5 and explains how to find the difference. Ideal for students in Grades 4-6.

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