LCM( 5, 2 ) = 10
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 5, b = 2 and GCD(5, 2) = 1.
$$ \text{LCM} (5, 2) = \frac{ 5 \cdot 2 }{ \text{GCD}(5,2)} = \frac{ 10 }{ 1 } = 10 $$