When naming angles, they all need to be connected on the line without overlapping any points previously said. Angle YXZ is incorrect because X is not on the same line as Z. YW is a line because both sides continue on forever, as indicated by the arrows.
3/5 is 0.6 7/8 is 0.875 0.6/0.875 is 0.685714286 0.685714286 is 685714286/1000000000 (not so sure about it but that was what i came up with hope i helped)
