For years, a French mathematician searched for a proof that a gigantic number is prime. His method is still used 150 years ...

A sharp rise in students without middle school-level math skills is raising alarms among educators and policymakers.

Most of us have little trouble working out how many milliliters are in 2.4 liters of water (it's 2,400). But the same can't be said when we're asked how many minutes are in 2.4 hours (it's 144).

For over a decade, mathematicians have failed to agree whether a 500-page proof is actually correct. Now, translating the ...