Every so often it's good to exercise your brain with a math problem or two that forces you to recall principles you learned decades prior. As elementary as it might feel, you'd be surprised how easy ...

70 + 30 ÷ 2 x 3. The simple math problem may have been a breeze in school, but as most people don't regularly solve equations, social media users were racking their brains to remember what to do. An X ...