If you were to look at the numbers on the grid running down to
the bottom left hand corner on the Square of Nine, you will find
they are the square root of odd numbers E.g. 5x5 = 25.
If you were to look at the numbers running up to the top right
hand corner on the Square of Nine you will find they are the
square root of even numbers e.g. 4x4 = 16.
If you then look at the numbers running down to the bottom right
hand corner on the Square of Nine you would find the midpoint
between the squares of odd and even numbers. Using the numbers
16 and 25 as an example of our odd and even numbers you will
find the number 21 representing their midpoint
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