BALTIMORE -- A new personal finance trend has TikTok users recommending humorous new ways to rethink their spending habits. We've all justified unnecessary purchases before, but now social media has ...

If it’s less than $5 it’s basically free. If you return an item for a refund, you’ve made money. If you paid for a vacation months ago, it’s free by the time you go on it. And if you buy something ...

I offer to pay you $200 in one year if you give me $190 today. Good deal or bad deal? It’s the kind of math problem you might encounter in real life, as opposed to, say, whether the cosecant of a ...

You pay for a latte with money from your Starbucks app, so your bank account balance doesn’t change. That means the coffee was basically free, right? This is just one example of “girl math,” a trend ...

Artificial intelligence can write a résumé, answer medical questions, and even have philosophical conversations. But one task it’s not always so good at is solving math problems—and that poses a ...

Chatbots like ChatGPT get stuff wrong. But researchers are building new A.I. systems that can verify their own math — and maybe more. By Cade Metz Reporting from San Francisco On a recent afternoon, ...