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We may be talking about, as Skidpan says 'really simple maths', but as I said, a lot of people have very little confidence in their ability to do maths. People really do struggle with day-to-day maths that I barely even have to think about.
I've been there, working in industrial plant, teaching operators how to do maths to help them to work out batching for non-standard sizes.
People who have that lack of confidence can get there, and build their confidence in how to do calculations. But slamming them down by saying 'God, that's simple' or 'basic stuff I could do in primary school', or 'the rot in education' .. all that says to the person asking is "you're thick, I can do this, you should be able to"
Not the most helpful attitude for people who struggle with their maths, I'm sure you'll agree.
Having some people take a superior attitude doesn't help them at all. A little bit of assisting (and hopefully teaching, by showing the basic workings out), rather than berating, might just mean that someone can do this for themselves in the future.
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