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To calculate the shaded area, we need to:

1. Determine the area of the larger square (outer square).
2. Determine the area of the smaller square (inner square).
3. Subtract the area of the smaller square from the area of the larger square.

### Step-by-step solution:

- **Outer square:**
  The side length of the larger square is given as 5 units.
  \[
  \text{Area of larger square} = 5^2 = 25 \, \text{square units}.
  \]

- **Inner square:**
  The side length of the smaller square is given as 2 units.
  \[
  \text{Area of smaller square} = 2^2 = 4 \, \text{square units}.
  \]

- **Shaded area:**
  The shaded area is the difference between the area of the larger square and the area of the smaller square.
  \[
  \text{Shaded area} = 25 - 4 = 21 \, \text{square units}.
  \]

Thus, the area of the shaded region is **21 square units**.

Would you like any further clarification or additional details?

Here are some related questions:
1. What if the side length of the larger square was different?
2. How would the result change if the smaller square was rotated?
3. Can you calculate the perimeter of both squares?
4. How does changing the size of the inner square affect the shaded area?
5. What happens if you add another square inside the smaller square?

**Tip:** When calculating areas involving squares, always make sure to square the side length correctly.

Calcule a área da região sombreada: (Image showing two squares, with the larger square having a side length of 5 units and the smaller square having a side length of 2 units.)

Learn how to calculate the shaded area between two squares with side lengths of 5 units and 2 units. This problem focuses on geometric concepts and the subtraction of areas. Suitable for middle school students (Grades 6-8).

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