Write an expression that shows the multiplication of a two digit number between 1 and 10 and another two digit number between 1 and 10 (different from the first), whose product is greater than 8, but less than 10.

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.