"This is a list that comprises some of the best math apps and extensions in Chrome store. We have literally gone through hundreds of apps to finally decide on the apps that would make the cut.These extensions are meant to help kids develop math skills through a wide variety of exercises, activities, games, interactive simulations and many more. Some of these apps are integrated with Google Drive and are also available for iPad, Android, and Chromebooks."
A free comprehensive math resource site. Find free worksheets, math ebooks for elementary grades, extensive link list of games, interactive tutorials & quizzes, curriculum guide, and math teaching help articles/lessons. The resources emphasize understanding of concepts instead of mechanical memorization of rules.
"What we believe in: Clean, quality, easily accessible, educational software for every school and child regardless of geographic location or economic class. What we don't believe in: Games, advertising, fees, spam or gimmicks."