model 25% on a 4 by 3 grid

need help ASAP!!!

Draw a rectangle length 4 and height 3.

The length is divided into 4 parts.
He divides the height into 3 parts.
In such a grid, a rectangle of length 1 and height 3 is indicated in gray.
This rectangle has an area of 1 / 4 = 25% of the total area because the total area is 4 x 3 = 12 and the area of that gray rectangle is 1 x 3 = 3, that is 1/4 of the total area.