ULearniversity is a free site featuring arithmetic and algebra lessons. On ULearniversity you can watch tutorial videos and practice the concepts taught in the videos. ULearniversity provides instant feedback on your practice problems. As a registered ULearniversity user you can track your progress.
Applications for Education
There is certainly no shortage of websites featuring flipped lessons and
instructional math videos. Some are better than others. One might suit a
student's preferences better than others. Therefore, it's worth trying
out a few to find the one that best meets your needs.