A grade-school math problem has stumped people. Can you solve the equation?

There are probably a lot of things you learned in school that you don’t even remember, but the “order of operations”—also known as PEMDAS—is likely to be one that stuck with you; you’ll mess up even ...

The confusion (likely intentional) boiled down to a discrepancy between the math rules used in grade school and in high school. By Steven Strogatz Recently I wrote about a math equation that had ...