Arrange them in the form of a triangular prism. Since this is a 3-dimensional object you will probably need some plasticine or bluetack balls to hold things together.
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Well you can look at it like this to help explain: _____ |_|_|_| |_|_|_| |_|_|_| Each small square is 1/9 (one ninth) of the large square. So if you have 3 over 9 (3 ninths) that is 3 small squares. If you have 4 over 9 (4 ninths) that is 4 small squares. 3 small squares is less than 4 small squares, as is 3/9 < 4/9.
Because 5 times 5 = 25 and 3 times 3 = 9
There are 81 squares in a 9 by 9 square.
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
9 x 9 = 81 squares.