A graphic artist is testing everyone’s knowledge of algebra and spot-the-difference skills with a pictograph math problem that assigns numbers to different fruits. Gergely Dudás, of Hungary Budapest, ...

Get out your timer and number two pencil to see if your arithmetic skills from grade school are still intact.

Everyone agreed on the first step: Solve inside the parentheses, for 2+2=4. But after that, people split down two paths. Some multiplied first, while others divided, leading to different answers—1 and ...

You probably think you're smarter than a middle schooler. If you want to know for sure, try your hand at this basic math problem. It's harder than it looks — even if you think you have a solid grasp ...