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The common denominator of the two fractions is: 36

$ \frac{1}{9 }= \frac{(1*4)}{(4*9)} =\frac{ 4}{36} $

$ \frac{1}{36 }= \frac{(1*1)}{(1*36)} =\frac{ 1}{36} $

Fractions adjusted to a common denominator

$ \frac{1}{9 }-\frac{ 1}{36 }=\frac{ 4}{36 }-\frac{ 1}{36} $

$ \frac{4}{36 }-\frac{ 1}{36 }= \frac{(4-1)}{36} $

$ \frac{(4-1)}{36 }=\frac{ 3}{36} $

$ \frac{3}{36 }=\frac{ 1}{12} $

$ $

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