LCM( 80, 110 ) = 880
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 80, b = 110 and GCD(80, 110) = 10.
$$ \text{LCM} (80, 110) = \frac{ 80 \cdot 110 }{ \text{GCD}(80,110)} = \frac{ 8800 }{ 10 } = 880 $$