When calculating the area of a rectangle, if the length is 5 units and the width is 3 units, what is the area?

To find the area of a rectangle, you use the formula:

Area = Length × Width.

In this case, the given length is 5 units and the width is 3 units. When you multiply these two dimensions:

Area = 5 units × 3 units = 15 square units.

Thus, the area of the rectangle is 15 square units, making the first choice the correct answer. This calculation highlights the straightforward nature of finding the area, which relies on the direct multiplication of the rectangle's length and width.