Question
Express the following decimals in the form $\frac{\text{p}}{\text{q}}:$
9.90

Answer

Given decimal is 9.90 Now we have to convert given decimal number into the $\frac{\text{p}}{\text{q}}$ form Let $\frac{\text{p}}{\text{q}}=9.90$$\Rightarrow\frac{\text{p}}{\text{q}}=\frac{990}{100}$
$\Rightarrow\frac{\text{p}}{\text{q}}=\frac{99}{10}$
Hence, $9.90=\frac{99}{10}$

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