People with a McJob don't need to calculate change: that's the cash register software's job. And many people avoid calculating their wage or budget -- their spouse does that kind of thing.
Perhaps you will reply they at least need to be able to count to 4 to hand back the right number of each coin. And need to be able to read numbers to answer questions like, "What does the Super Mushroom Burger cost?"
But the blatant usefulness of a skill is no argument in favor of required education of it -- won't people want to learn it voluntarily? And those who disagree, why can't you leave them alone?
Perhaps you will reply they at least need to be able to count to 4 to hand back the right number of each coin. And need to be able to read numbers to answer questions like, "What does the Super Mushroom Burger cost?"
But the blatant usefulness of a skill is no argument in favor of required education of it -- won't people want to learn it voluntarily? And those who disagree, why can't you leave them alone?