Despite the greatest strides in mathematics, these hard math problems remain unsolved. Take a crack at them yourself.

Dive into one of the most wicked geometry problems and see it explained step by step in a clear, intuitive way. This lesson breaks down the hidden structure, key insights, and clever reasoning that make the problem so challenging—and so satisfying to solve.

For more than 150 years, the Riemann hypothesis has stood as one of the major unsolved problems in mathematics, a long-running mystery about the distribution of prime numbers. There is currently a $1 million bounty for a working general proof of the ...

Elementary school students who learn to calculate using a mental abacus tend to perform better on math tests than their peers. A recent study published in Learning and Individual Differences suggests that this educational technique is associated with stronger arithmetic performance.

Among high school students and adults, girls and women are much more likely to use traditional, step-by-step algorithms to solve basic math problems – such as lining up numbers to add, starting with the ones place, and “carrying over” a number when ...