| $$ \begin{aligned}18 \cdot \frac{n}{30n^8}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{18n}{30n^8}\end{aligned} $$ | |
| ① | Multiply $18$ by $ \dfrac{n}{30n^8} $ to get $ \dfrac{ 18n }{ 30n^8 } $. Step 1: Write $ 18 $ as a fraction by putting $ \color{red}{1} $ in the denominator. Step 2: Multiply numerators and denominators. Step 3: Simplify numerator and denominator. $$ \begin{aligned} 18 \cdot \frac{n}{30n^8} & \xlongequal{\text{Step 1}} \frac{18}{\color{red}{1}} \cdot \frac{n}{30n^8} \xlongequal{\text{Step 2}} \frac{ 18 \cdot n }{ 1 \cdot 30n^8 } = \\[1ex] & \xlongequal{\text{Step 3}} \frac{ 18n }{ 30n^8 } \end{aligned} $$ |