​0.5 divided by -5 times50

0.5 / -5 * 50

 

0.5 / -5 is the same thing as -5/50 (multiplying by -5/50)

 

-5/50 * 50

-5*50/50

 

50's on the top and bottom cancel out, leaving us with -5.

 

-5*50/50 = -5