81
1 9x9, 4 8x8, 9 7x7, all the way to 81 1x1. So it is 12 + 22 + 32 +...... + 92 =285
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There are 9 rows and 9 columns. There is 81 individual squares in one grid.
Infinitely many, but only 30 squares within a 1 unit grid. 4*4 square: 1 3*3 squares: 4 2*2 squares: 9 1*1 squares: 16
Counting squares whose sides are along the grid-lines, there are 154.
1+4+9 = 14 squares.
Make each square 1 x 1