TV411 - Site offers lessons for adults to strengthen their literacy skills. You can also view lessons with your children to show real world applications of math. Some lessons are also available in Spanish.
This is a digital library containing Java applets and activities for K-12 mathematics. Some of the activities include creating charts, using base 10 blocks, number lines, and fractions. Areas covered are Number & Operations, Algebra, Geometry, Measurement, and Data Analysis & Probability.