Practice with Java or non-Java flashcards and games. The games lack instructions, but they don't take too much time to figure out. The Homework Helper will tell you if your answers to simple math problems are correct. Create worksheets based on your level to focus on areas of weakness such as decimal division and multiplication, and fractions. This site aims to give teen and preteen girls a solid background in math so they can achieve in business, science and technology careers.
Girls can also ask each other for help on bulletin boards.
In Your Turn to Talk, students share study and test tips, and math puzzles. This site assembles an impressive array of math helpers. If you're stumped by a homework problem, click on Ask Dr. Math to peruse extensive archive and FAQ pages covering levels from elementary school through college. If you can't find an answer, e-mail your query to the math experts. Diagrams would be a helpful addition to some of the answers here.