There's something different about maths.

In the UK, many people will happily say, "I can't do maths" or, "I'm no good with numbers". They're almost proud of it.

I've occasionally had shopkeepers be surprised when I've handed over coins so I get a round £5 back in change, yet it's expected that seven year old children can do this. What goes wrong?

Consider a clothes shop, with a sign: "20% off all marked prices!". I wonder how many people could say what the £50 jacket costs, or the £30 jeans.