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I think you wanted to write 'What is 5% of 100?' -that is the only way the exercices of this type can be solved. :)

5\% \ of \ 100= \\\\ =\frac{5}{100}*100= \\\\ = \frac{5}{1}*1= \\\\ = \boxed{5}

For example you may have an exercice like this:  Find the percentage of the change. Original:54     New:45

p\to percentage \\\\ p\% \ of \ 54=45 \\\\ \frac{p}{100}*54=45 \\\\ \frac{p}{100}=\frac{45}{54} \\\\ \frac{p}{100}=\frac{5}{6} \\\\ p=\frac{100*5}{6} \\\\ p=\frac{50*5}{3} \\\\ p=\frac{250}{3} \\\\ \boxed{p=83.3\%}