How to work out wall stud spacings....

I've searched first without any joy so apologies if this has already been asked.

Working on building in downstairs in Qld and I am ready to go with the framing. I have a couple of questions and I think I have the following correct.

Walls are non load bearing. (House is structurally supported on 90mm steel posts).
Framing timber is to 90x45 F5 @ 450mm centres (I think I can go to 90x35 but the price break isn't that attractive and I want to minimise any potential movement later).

If I have a wall opening of oh let's say 1860, (which isn't divisable by 450), then how do I work out the stud spacings? Do I:

a) Put a stud in the centre and then work out to the edges?
b) Start from one side and work across with a smaller stud opening for the 4th stud?
c) Divide 1860 by 450 and round down to a whole number and have the spacings at 465mm?

I realise that in these calculations I haven't taken into account the studs themselves but I hope that this has come across clear enough?

Thanks in advance

Frank


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