Space Math is a NASA website containing space-themed math lessons for students in elementary school through high school. This evening I revisited for the first time in a couple of years and noticed that it now offers more than 700 math problems related to space and space exploration.
On Space Math you can search for problems according to grade level or mathematics topic. The bulk of the materials seem to be PDFs of directions for carrying out the lesson plans. The exception to that pattern being the middle school (grades 6-8) resources which include the use of some of NASA eClips videos.
While you're exploring the Space Math problems you might also want to check out the free ebook, A Guide to Smartphone Astrophotography which is currently featured on the Space Math homepage.
Applications for Education
Each of the Space Math lessons align to different NASA missions. The NASA missions provide the context for the math lessons. That alignment makes Space Math lessons a good option for an integrated science and mathematics lesson.