LCM( 25, 16 ) = 400
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 = 16 and GCD(25, 16) = 1.
$$ \text{LCM} (25, 16) = \frac{ 25 \cdot 16 }{ \text{GCD}(25,16)} = \frac{ 400 }{ 1 } = 400 $$