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The common denominator of the two fractions is: 80

$ \frac{5}{16 }= \frac{(5*5)}{(5*16)} =\frac{ 25}{80} $

$ \frac{1}{20 }= \frac{(1*4)}{(4*20)} =\frac{ 4}{80} $

Fractions adjusted to a common denominator

$ \frac{5}{16 }-\frac{ 1}{20 }=\frac{ 25}{80 }-\frac{ 4}{80} $

$ \frac{25}{80 }-\frac{ 4}{80 }= \frac{(25-4)}{80} $

$ \frac{(25-4)}{80 }=\frac{ 21}{80} $

$ $

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