140
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25
7 x 7 = 49
20 squares x 20 squares = 400 squares
There is a formula for "the difference of squares." (x + 7)(x - 7) = 0 x = 7, -7
4 squares in a 2 by 2 grid 9 squares in a 3 by 3 grid 16 squares in a 4 by 4 grid 25 squares in a 5 by 5 grid 36 squares in a 6 by 6 grid 49 squares in a 7by 7 grid 64 squares in a 8 by 8 grid 81 squares in a 9 by 9 grid 100 squares in a 10 by 10 grid