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To calculate the percent error in Greg's estimate, we use the following formula:

\[
\text{Percent Error} = \frac{|\text{Actual Value} - \text{Estimated Value}|}{\text{Actual Value}} \times 100
\]

In this case:
- The actual distance is 22 miles.
- Greg's estimate is 18 miles.

So,

\[
\text{Percent Error} = \frac{|22 - 18|}{22} \times 100 = \frac{4}{22} \times 100 \approx 18.18\%
\]

Rounded to the nearest whole percent, the percent error is **18%**.

Would you like further details or have any questions?

Here are some related questions to explore:
1. What is the formula for calculating percent error?
2. Why is the absolute value used in the percent error calculation?
3. Can percent error be negative? Why or why not?
4. How do you interpret a high percent error compared to a low percent error?
5. How can improving estimates reduce the percent error?

**Tip**: Always compare the actual value to the estimate carefully to avoid large percent errors.

Greg estimates that Megan lives 18 miles away, but she actually lives 22 miles away. What is the percent error in Greg's estimate?

Learn how to calculate the percent error in Greg's estimate, where he thought Megan lived 18 miles away but she actually lived 22 miles away. Using the percent error formula, the solution is rounded to 18%. Suitable for students in Grades 6-8.

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