Is it off or of?upid

1/3 of 1 = 1/3
1/3 off 1 = 2/3

off = subtraction from the sum no?

Always took it as meaning "can you run one copy of this off". Such as 4 off this, 3 off that. I'm talking purely in a CAD environment and it's certainly how we used it, in fact if anyone wrote "2 of" they'd be pulled up for it.
 
when doing a-levels I have CAD job in fabrications. They used 'x off this, y off that'.

I always presumed it was 'x copies off the press/bench/press/etc'.
 
1/3 of 1 = 1/3
1/3 off 1 = 2/3

off = subtraction from the sum no?

That's how I would interpret those words if I saw them in my little sisters maths homework. I suppose that's probably how most people would interpret those words in such a context.

But, for whatever reason, in the mentioned context, off is used, I'm guessing because it's a shortened version of another phrase, rather than a whole industry being full of people who get off and of mixed up... Although, I suspect that it could well be possible that one mistake once, somewhere, supported adamantly enough by its creator could infect an entire industry without too much difficulty... Although I don't think that's likely.
 
@Voltar and others

Not sure why people are acting like this.

It's a reasonable question to ask and I've never heard the word used in this context. My first thought was that it should be "of", but I suppose it makes sense.
 
@Voltar and others

Not sure why people are acting like this.

It's a reasonable question to ask and I've never heard the word used in this context. My first thought was that it should be "of", but I suppose it makes sense.

Yep, turns our it was a good question and I've learnt something new.
 
to me it depends on under what circumstances its used...

in a lot of situations to me it sounds as wrong as people who say "axe" instead of "ask"

the whole thing beeing used outside of engineering etc probably came from people trying to be smart

its not people saying what they want from the lunch run is it? "i want 4 off those cheese buns and one off those cans of coke"
 
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