How many 3by 3 squares on a chess board?

A standard chessboard is an 8 by 8 grid. To find the number of 3 by 3 squares, you can determine how many positions the top-left corner of a 3 by 3 square can occupy. The top-left corner can be placed in any of the first 6 rows and the first 6 columns, resulting in (6 \times 6 = 36) possible 3 by 3 squares on a chessboard.