Novelist Celeste Ng has shared a head-scratching system of equations that her 9-year-old son apparently made up over dinner: At dinner, 9yo made up a math problem and made his father and me solve it.

The Riemann Hypothesis is one of the most famous problems in that set. It’s about prime numbers. That’s any whole number that can only be divided by 1 and itself – like 2, 3, 5, 7 and 11.

A graphic artist is testing everyone’s knowledge of algebra and attention to detail with a pictograph math problem that assigns numbers to different plants. Gergely Dudás, of Budapest, Hungary, shared ...

A system of nonlinear equations is harder to solve than you think—and more of a puzzle than a math problem. Puzzles like this require you to look and find the one loose end you can pull to unravel the ...

A system of nonlinear equations is harder to solve than you think—and more of a puzzle than a math problem. Puzzles like this require you to look and find the one loose end you can pull to unravel the ...