LCM( 756, 810 ) = 11340
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 756, b = 810 and GCD(756, 810) = 54.
$$ \text{LCM} (756, 810) = \frac{ 756 \cdot 810 }{ \text{GCD}(756,810)} = \frac{ 612360 }{ 54 } = 11340 $$