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.
10
There are 2025 rectangles in a 9x9 grid.
Just four rectangles comprise 64 squares of the same size: 1X64, 2X32, 4X16, and 8X8.
That depends on how big the rectangles are.
Well, honey, in a 4 x 6 grid, you've got a total of 30 rectangles. You've got your 24 smaller rectangles formed by the individual squares, then you add 4 rectangles formed by 2 x 2 squares, and finally, you top it off with 2 rectangles formed by 3 x 2 squares. So, grab a calculator if you need to, but that's the tea!