| $$ \begin{aligned}10 \cdot \frac{x^2}{25x}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{10x^2}{25x}\end{aligned} $$ | |
| ① | Multiply $10$ by $ \dfrac{x^2}{25x} $ to get $ \dfrac{ 10x^2 }{ 25x } $. Step 1: Write $ 10 $ as a fraction by putting $ \color{red}{1} $ in the denominator. Step 2: Multiply numerators and denominators. Step 3: Simplify numerator and denominator. $$ \begin{aligned} 10 \cdot \frac{x^2}{25x} & \xlongequal{\text{Step 1}} \frac{10}{\color{red}{1}} \cdot \frac{x^2}{25x} \xlongequal{\text{Step 2}} \frac{ 10 \cdot x^2 }{ 1 \cdot 25x } = \\[1ex] & \xlongequal{\text{Step 3}} \frac{ 10x^2 }{ 25x } \end{aligned} $$ |