Rhoumbus

19 4/5  /   2     =    99/5  /  2/1   =  99/5  x 1/2 =  99/ 10 =  9 9/10

$19\dfrac{4}{5}\div 2\\ =19\div 2 + \dfrac{4\div 2}{5}\\ =9\dfrac{1}{2}+\dfrac{2}{5}\\ =9.5 + .4\\ = 9.9\\ =9\dfrac{9}{10}$