Question

find the lcm of 4 and 5 by listing their multiples

Answer 1

$$\begin{gathered} \mathrm{Multiples}\mathrm{of}4=4,8,12,16,\mathbf{20},24,28,....... \\ \mathrm{Multiples}\mathrm{of}5=5,10,15,\mathbf{20},25,30,35,..... \\ \mathrm{LCM}\mathrm{of}4\mathrm{and}5=20 \end{gathered}$$