NASA
Nasa: Space Math I
This educator's guide provides students with the opportunity to solve mathematical problems related to space science. Includes space background information, lesson plans, and answer keys.
Math Planet
Math Planet: Pre Algebra: Solving Problems With Percent
Discover how to solve problems with percent by taking a look at examples and a video lesson.
Math Planet
Math Planet: Algebra 1: Calculating With Percents
Provides examples and a video lesson that illustrates how to solve percent problems.