To find what percentage \(\dfrac{9}{10}\) of a number is of that number, we can denote the number as \(x\).
First, we calculate \(\dfrac{9}{10}\) of \(x\):
\[ \dfrac{9}{10} \cdot x = \dfrac{9x}{10} \]
Next, to convert \(\dfrac{9x}{10}\) into a percentage of \(x\), we need to divide \(\dfrac{9x}{10}\) by \(x\) and then multiply by 100%:
\[ \text{Percentage} = \left(\dfrac{\dfrac{9x}{10}}{x}\right) \cdot 100% \]
Simplifying this expression:
\[ \text{Percentage} = \left(\dfrac{9}{10}\right) \cdot 100% \]
Calculating \(\dfrac{9}{10} \cdot 100%\):
\[ \text{Percentage} = 90% \]
Thus, \(\dfrac{9}{10}\) of a number is \(90%\) of that number.
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