Add Yahoo as a preferred source to see more of our stories on Google. We like to think that we're pretty good at math, especially after years of schooling. But every once in a while, a simple ...

A simple math problem sparked heated debate on Chinese education forums two years ago. A man gives his son six yuan to buy bread. The boy spends four yuan. How much change does the seller return? The ...

These deceptively simple math problems stump even the smartest people—and it's not because they're too hard. It’s because smart minds tend to overthink. Think you can beat the trap? Plan for extra ...