Question
Answer
$$\dfrac{21}{3+12}=\dfrac{7}{5}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{21}{3+12}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{21}{15} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}} \frac{ 21 : \color{orangered}{ 3 } }{ 15 : \color{orangered}{ 3 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{7}{5}\end{aligned} $$ | |
| ① | Simplify numerator and denominator |
| ② | Divide both the top and bottom numbers by $ \color{orangered}{ 3 } $. |
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