Step aside, “girl dinner” — it’s time for “girl math.” Girl math revolves around justifying your spending habits in creative ways, like subscribing to the idea that if you buy clothes and later return ...

While I am financially savvy, I’m also into some lighthearted spending logic. And if your math brain works anything like mine, we might agree on some things: anything less than $5 is free; it’s smart ...

Forbes contributors publish independent expert analyses and insights. Dani Di Placido covers film, television, and internet culture. You might have seen the term “Boy Math” thrown around the internet ...

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 ...