www.aleks.com
Math games: http://www.mangusmath.com/math_links.htm
Osborne link: http://usborne-quicklinks.com/usa/usa_entity_pages/usa_select_page.asp?lvl=1&menu=s70&id=1497
数学问答：http://mathforum.org/dr.math/
Fun practices: http://www.k111.k12.il.us/king/math.htm
免费 Math Worksheets： http://www.homeschoolmath.net/worksheets/
http://aaamath.com/
http://epgy.stanford.edu/
http://www.multipi.com/
http://www.beestar.org/index.jsp
http://www.beestar.org/index.jsp
这个是收费的：http://themathworksheetsite.com/
各种 interactive math puzzles http://www.cut-the-knot.org/games.shtml
汉诺威塔 Tower of Hanoi http://mazeworks.com/hanoi/ or http://www.lhs.berkeley.edu/Java/Tower/Tower.html
数独 （Sudoku puzzles） http://www.dailysudoku.co.uk/sudoku/index.shtml
Griddlers http://www.griddlers.net/
Paint-by-numbers (same thing as griddlers)
http://www.blindchicken.com/~ali/games/puzzles.html
各种逻辑游戏 (griddlers, cross-sums, sudoku, the other types of puzzles that give you pictures, mazes, etc.) http://conceptispuzzles.com/
逻辑游戏 http://www.puzzles.com/Projects/LogicProblems.html
更多逻辑游戏 http://www.nickvautier.com/puzzles/
Nonograms (same thing as griddlers) http://www.geocities.com/activityworkshop/puzzlesgames/nonograms/
