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The common denominator of the two fractions is: 100

$ \frac{61}{10 }= \frac{(10*61)}{(10*10)} =\frac{ 610}{100} $

$ \frac{393}{100 }= \frac{(1*393)}{(1*100)} =\frac{ 393}{100} $

Fractions adjusted to a common denominator

$ \frac{61}{10 }+\frac{ 393}{100 }=\frac{ 610}{100 }+\frac{ 393}{100} $

$ \frac{610}{100 }+\frac{ 393}{100 }= \frac{(393+610)}{100} $

$ \frac{(393+610)}{100 }=\frac{ 1003}{100} $

$ $

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