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To determine the length of \( PQ \), we use the formula for the distance between two points on a number line:

\[
| P - Q |
\]

Here, point \( P \) is at \( -4 \), and point \( Q \) is at \( 0 \). So, the length of \( PQ \) is:

\[
| -4 - 0 | = | -4 | = 4
\]

Thus, the length of \( PQ \) is **4 units**.

Would you like a more detailed explanation or have any other questions?

Here are some related questions to think about:
1. How do you find the distance between two points on a coordinate plane?
2. What would the length of \( PQ \) be if \( Q \) was at \( 5 \)?
3. Can the length of any line segment ever be negative?
4. How does this method apply to points that are not on a number line but in a plane?
5. How would you calculate the midpoint of \( PQ \)?

**Tip:** Always remember that the length of a segment is the absolute value of the difference between the two points.

Learn how to calculate the length of PQ on a number line with a simple formula. This problem explores the distance between two points, where P is at -4 and Q is at 0, providing a clear step-by-step solution. Suitable for students in Grades 6-8.

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