we know that the number [tex]5.8[/tex] is equal to [tex]5+0.80 [/tex] and [tex]0.80[/tex] is equal to [tex]8/10[/tex] divide by 2 both members [tex] \frac{8}{10} = \frac{4}{5} [/tex]
therefore
the number [tex]5.8[/tex] is equal to [tex]5 \frac{4}{5} [/tex]