LCM( 25, 45 ) = 225
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 25, b = 45 and GCD(25, 45) = 5.
$$ \text{LCM} (25, 45) = \frac{ 25 \cdot 45 }{ \text{GCD}(25,45)} = \frac{ 1125 }{ 5 } = 225 $$