Other
Kid's Page Archive: Free Printable Math Worksheets
Great source for math worksheets on all four whole number operations, fractions, and miscellaneous arithmetic topics. Could be used to assess basic arithmetic skills for areas that need remediation.
Wolfram Research
Wolfram Math World: Series
This page gives a great overview of series in mathematics, including a definition of convergence and divergence. Provides links to more information about specific types of series.