Question

find the LCM of following numbers using prime factorisation method : 15, 25,40

Answer 1

The prime factorisation of 15, 25 and 40 are given by;
$$\begin{gathered} 15=3\times 5 \\ 25=5\times 5 \\ 40=2\times 2\times 2\times 5 \end{gathered}$$
So L.C.M of 15, 25 and 40 = $2\times 2\times 2\times 5\times 5\times 3=600$