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

If the parts are equal, then it is not difficult to find the entire area, knowing the value of 1/8 of the area. To do this, 5 should be multiplied by 8.

5 * 8 = 40 (cm²) – the area of the entire rectangle.

You can also briefly write the condition like this (in the form of a proportion):

1/8 = 5

8/8 = x

x = 8/8 * 5: 1/8 = 40/8: 1/8 = (40 * 8): (1 * 8) = 320: 8 = 40 (cm²)

Answer: 40 cm² is the area of the entire rectangle.