The article doesn't say the motive behind that murdered tranny? Why'd the killer do it? I suspect he's a psycho because he went to the point of murder, but I also suspect the tranny to have walked into it, like the one who went up to kids and pepper sprayed them. First rule of personal safety: Don't mess with the wrong people, don't antagonize potential aggressors. Violence is often done as a response to maintain pride - just learn to let it be.
The Globe and Mail article seems to imply some correlation to the transwoMAN's activism, but I'm not sure. We need more details. I think there's no relation - as in, the killer did not take this activism into account when he killed. Doubt it was premeditated.
As for the math thing, now that I'm not sleepy anymore, I see another easy in-your-head solution:
463+647:
400 + 600 = 1000
60+40 = 100
3+7 = 10
His solution with subtracting is fucking retarded, convoluted for no reason at all whatsoever, even if you forget the typos. This man is an idiot.
There are myriads of easier, simpler ways to do it than his.
I hope he posts more failmath so I can post more optimal solutions.