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In this problem, you are asked to represent the space between the tick marks on the number line using a unit fraction and to write an expression that involves subtraction to find the difference.

The two arrows (red and blue) show two different values on the number line. Here's how to interpret it:

1. **Identify the tick mark interval**: From the number line, the distance between two tick marks is likely \( \frac{1}{2} \) (1/2 units).
   
2. **Determine the positions of the endpoints**:
   - The **red arrow** starts at \( -1 \) and ends at \( 0 \).
   - The **blue arrow** starts at \( 0 \) and ends at \( 1 \frac{1}{2} \) (or \( 1.5 \)).

3. **Write an expression**: The subtraction is modeled by the endpoints of the red and blue arrows.
   - The difference between the two values is \( 1.5 - (-1) \).

4. **Simplify the expression**:
   \[
   1.5 - (-1) = 1.5 + 1 = 2.5
   \]
   
So, the difference is \( 2.5 \).

Would you like more details or have any questions?

Here are five related questions:
1. What is a rational number?
2. How do you subtract negative numbers on a number line?
3. Why is subtracting a negative number the same as adding a positive number?
4. Can you show another example of subtracting two numbers from the number line?
5. How would this problem change if the intervals between tick marks were different?

**Tip**: Always double-check whether the subtraction involves negative numbers—this often changes the operation to addition!

Choose a unit fraction to represent the space between the tick marks on the number line. Write an expression involving subtraction that is being modeled. Then find the difference.

Learn how to subtract rational numbers using a number line with a detailed step-by-step solution. This problem covers key concepts in number lines, rational numbers, and the subtraction of negative numbers. Suitable for Grade 7 students.

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