LCM( 8, 30 ) = 120
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 8, b = 30 and GCD(8, 30) = 2.
$$ \text{LCM} (8, 30) = \frac{ 8 \cdot 30 }{ \text{GCD}(8,30)} = \frac{ 240 }{ 2 } = 120 $$