Question

Find the LCM of $20$ and $30$.

Answer 1

LCM of $20$ and $30$ by prime factorization method

Prime factorization of given numbers

$$\begin{gathered} 20=2\times 2\times 5 \\ 30=2\times 3\times 5 \end{gathered}$$

LCM of $20$ and $30$$=2\times 2\times 3\times 5=60$

Hence, the required answer is $60$ .