Calculate: (z)/(5) * (z+3)/(8)

Expression: $\frac{ z }{ 5 } \times \frac{ z+3 }{ 8 }$

Multiply the fractions

$\frac{ z \times \left( z+3 \right) }{ 40 }$

Distribute $z$ through the parentheses

$\frac{ {z}^{2}+3z }{ 40 }$