The rectangle was cut into 8 equal pieces. Find the area of a rectangle if the area of one eighth of it is 5 cm2.

To find the area of a rectangle, knowing the size of the area of its 1/8 part, you need to use the following formula.

S = S1 * n
Where
S is the area of the entire rectangle.
S1 is the area of one of its parts.
n is the number of parts of the rectangle.

Since the rectangle was divided into 8 identical parts, and the area of one of its parts is 5 square centimeters.
The numeric expression will look like this.

S = 5 * 8 = 40 square centimeters.

Answer.
The area of the entire rectangle is 40 centimeters squared.