Addition like multiplication

Let the number be $x$ . Then

$\begin{aligned} x + \frac 83 & = \frac 83 x \\ 3x + 8 & = 8x \\ 8x - 3x & = 8 \\ 5x & = 8 \\ \implies x & = \frac 85 = \boxed{1.6} \end{aligned}$

$\begin{aligned} x+\frac{8}{3} &= \frac{8}{3} x \\ \implies -\frac{5}{3}x &= -\frac{8}{3} \\ \implies x &= \frac{-\frac{8}{3}}{-\frac{5}{3}} = \green{\boxed{\frac{8}{5} = 1.6}} \end{aligned}$

Let the number be $x$

$\rightarrow x + \frac {8}{3} = x × \frac{8}{3}$
$\rightarrow 3x + 8 = 8x$
$\rightarrow 8 = 5x$
$\rightarrow x = \frac {8}{5} = \boxed{1.6}$