Square-ception

There's the largest square: 1.
There's the green square: 1.
The green square splits into 4 green squares: 4.
There's 4 squares: top left, top right, bottom left, bottom right.

So there's a total of $1+1+4+4 = 10$ squares.

4 yellow & green squares + 4 small green squares + 1 big green square + 1 biggest yellow & green square

Bonus question: How many quadrilaterals are in the image

The large square The green central square The four squares into which the green square is divided. The four squares into which the large square is divided 4+4+1+1 = 10

The given image is a 2×2 grid with small 2×2 grid at the middle. To get the no. of squares in a 2×2 grid, add the sum of the squares of 1 and 2 i.e 1^2 + 2^2 = 1+ 4= 5 Since there is another 2×2 grid at the middle multiply 5 by 2 Therefore, there are 10 squares.

Another solution 2(1^2 + 2^2) = 2(5) =10 squares

The whole square, the whole green square , and the divided yellow and green square..

5 of the green ones ( 4 inner, 1 whole )and 5 of the brown ones( 4 inner, 1 whole)

count the lines. they add up to 10.

The 8 directly visible, as well as the square as a whole and the green square formed by the 4 small squares. 10.

Inside as well out side will have 5 each ,so total 10 Ans K.K.GARG,India

1 exterior,4pieces of the outer one,1inner and 4 pieces of the inner one

1 big square divided into 4 smaller squares making a total of 5. 1 central smaller square divided into 4 even smaller ones making another total of 5. Together they make 10.