This looks fun for future rocket scientists AND math/science teachers!
From the site:
Space Math@NASA - http://spacemath.gsfc.nasa.gov - contains more than 40 math problems in PDF format. By solving these mathematical and real-world problems, K–12 students also learn about astronomy and space science. The current problems will remain online through December; a new batch will be posted in January 2010. Educators can join the E-Teachers listserv to receive announcements about new content on Space Math.