60
96 rectangles.
seven
10
Just four rectangles comprise 64 squares of the same size: 1X64, 2X32, 4X16, and 8X8.
It is not possible to answer in terms of a grid that cannot be seen, but a normal grid of 2 squares x 2 squares will have 5 squares.
4 rectangles
96 rectangles.
90
14
9
seven
None they're all squares.
24 sqares in a gris 4x6
There are 2025 rectangles in a 9x9 grid.
10
Just four rectangles comprise 64 squares of the same size: 1X64, 2X32, 4X16, and 8X8.
That depends on how big the rectangles are.