CryptoKids: Want to learn about Cryptography and what types of jobs use it? Check out this site from the National Security Agency (NSA). This site is great for elementary and middle school students.
Mathematical Moments: The American Mathematical Society (AMS) provides Mathematical Moments online for free. It’s a wonderful collection of posters on how math is really used in the real world.
AMS Notes: The American Mathematics Society (AMS) publishes their Notices online which are somewhat math heavy but some of the articles contain great math facts and uses of math in the real world.