The area of the square is 64m2 Its fourth part is shaded. Calculate its area.

There are two solutions:
First, find the root of the number 64 (the number that, when multiplied by itself, will give this number), this will be the side of the square. Divide it by 2, we get 4, this is the side of 1/2 of the square, the other side is not touched. Now we divide it by 2. It turns out 4. We twice divided the square by 2, and got a quarter of its previous value. Now, to find the area, you just need to multiply 4 * 4 = 16 m ^ 2. this is the area.
Second, it is much faster: divide the existing area (64) by 4.64 / 4 = 16 m ^ 2