I widely recommend the DragonBox series. DBox Algebra does a good job of teaching algebra to kids who can barely do arithmetic. https://play.google.com/store/

I widely recommend the DragonBox series. DBox Algebra does a good job of teaching algebra to kids who can barely do arithmetic. https://play.google.com/store/apps/details?id=com.wewanttoknow.DragonBoxPlus&hl=en https://play.google.com/store/apps/details?id=com.wewanttokn...