Math Marathons is a Marathons of Math Word Problems, Here the kids from 1st to 5th grade can run the different Marathons.
This vary simple to use and good for learning the math basics with with word problems. It teaches kids the patients to read and learn the math.. Also they can go through the training for a marathon.
http://www.abitalk.com/
http://www.mathpup.com/
http://planeta42.com/
uk.durgansh
https://gamebol.com/
http://mathventures.io/
Margoapps
http://www.hoodamath.com/
gunavingri