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To find the amount of ribbon David will need, we must calculate the perimeter of the classroom board. The perimeter $ P $ of a rectangle is given by the formula:

\[
P = 2 \times (\text{Length} + \text{Width})
\]

Here, the length is 24 inches, and the width is 16 inches. Let's calculate the perimeter:

\[
P = 2 \times (24 + 16) = 2 \times 40 = 80 \, \text{inches}
\]

Thus, David will need 80 inches of ribbon.

The correct answer is **C. 80 inches**.

Would you like more details, or do you have any questions? Here are some related questions you can explore:

1. How would the perimeter change if the dimensions of the board were doubled?
2. What is the area of the board with the given dimensions?
3. If the ribbon costs $0.50 per inch, how much would David spend on ribbon?
4. How would the calculation change if the board had a circular shape?
5. What is the perimeter of a square board with a side length of 24 inches?

**Tip:** The perimeter of any polygon is the sum of all its sides. For a rectangle, this can be simplified to $2 \times (\text{Length} + \text{Width})$.

A classroom board is 24 inches wide and 16 inches tall. David is putting ribbon along the outside edge of the board. How many inches of ribbon will he need?

Learn how to calculate the perimeter of a rectangle with dimensions 24 inches by 16 inches. This geometry problem involves key concepts like the perimeter formula, and it's suitable for students in Grades 4-6.

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