LCM( 36, 63 ) = 252
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 36, b = 63 and GCD(36, 63) = 9.
$$ \text{LCM} (36, 63) = \frac{ 36 \cdot 63 }{ \text{GCD}(36,63)} = \frac{ 2268 }{ 9 } = 252 $$