Question

Find LCM of the $5,10,15,20$

Answer 1

Solve for the prime factors to find the L.C.M.

The prime factors for the given numbers are given below,

The prime factor of $5$ $=1\times 5$

The prime factors of $10$ $=1\times 2\times 5$

The prime factors of $15$ $=1\times 3\times 5$

The prime factors of $20$ $=1\times 2\times 2\times 5$

$$\begin{gathered} \therefore LCM(5,10,15,20)=2^2\times 3^1\times 5^1 \\ \Rightarrow LCM(5,10,15,20)=60. \end{gathered}$$

Hence, the LCM of $5,10,15$ and $20$ is $60$.