(-200 5/6)+(-199 2/3)+400 3/4+(-1 1/2)
=(-200-5/6)+(-199-2/3)+(400+3/4)+(-1-1/2)
=(-200-199+400-1)+(-5/6-2/3+3/4-1/2)
=0+(-10-8+9-6)/12
=-1/4