What's the Lowest Common Multiple (LCM) of $7$ and $8$?

Least common multiple $\mathbf{\left(}\mathbf{LCM}\mathbf{\right)}$.

$\mathrm{LCM}$ is the smallest number that is common in all the given numbers multiples.

Multiples of the given numbers $7,8$ are,

Multiples of $7$$=7,14,21,28,35,42,49,\mathbf{56},63,70$

Multiples of $8$$=8,16,24,32,40,48,\mathbf{56},64,72,80$

It is observed that, $56$ is the smallest number that is common in all the given numbers multiples.

Hence, the $\mathrm{LCM}$ of $7,8$ is $56$.