Okay, so I have no way of using the numpad in Garry's Mod. Immediately you can say "get an external keyboard". Okay! I WILL. The next time I'm in town I'll get one. But for now, what can I do?
GMod's keyboard options won't let me have two keys be pressed for a numpad key. E.g. I wanted Shift+1 Numpad 1. Can't do it.
What do?
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Look for the Num Lock key, press it. Your keyboard now has a number pad (little numbers on the right side of existing keys). At least that's how mine is.