LCM( 66, 110 ) = 330
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 66, b = 110 and GCD(66, 110) = 22.
$$ \text{LCM} (66, 110) = \frac{ 66 \cdot 110 }{ \text{GCD}(66,110)} = \frac{ 7260 }{ 22 } = 330 $$