Question
Answer
$$4\cdot\dfrac{\sqrt{80}}{80}=\dfrac{\sqrt{5}}{5}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4 \cdot \frac{\sqrt{80}}{80}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4 \cdot \frac{\sqrt{5}}{20} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{4\sqrt{5}}{20} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{\sqrt{5}}{5}\end{aligned} $$ | |
| ① | Divide both numerator and denominator by 4. |
| ② | $$ \color{blue}{ 4 } \cdot \sqrt{5} = 4 \sqrt{5} $$$$ \color{blue}{ 1 } \cdot 20 = 20 $$ |
| ③ | Divide both numerator and denominator by 4. |
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