LCM( 9, 100 ) = 900
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 9, b = 100 and GCD(9, 100) = 1.
$$ \text{LCM} (9, 100) = \frac{ 9 \cdot 100 }{ \text{GCD}(9,100)} = \frac{ 900 }{ 1 } = 900 $$