Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. There are two types: Riddler Express for those of you who want ...

OUR mathematical readers who do not read German will be glad to know that they have now before them a translation of a discussion of three famous geometric problems of antiquity, namely, the ...

Experts agree: Elementary teachers need to have a strong foundation in math. But teacher-preparation programs don’t always dedicate much time to elementary math coursework. That’s starting to change, ...