Khan Academy is a great website for students, parents, teachers, tutors, and just anyone who wants to learn. It is completely FREE and offers many courses. I did a blog post for teachers on this, you can check out by clicking here. Parents, you can create a free login and create one for your child. I recommend also checking with the teacher to see if they have made one for your child, or see if there is time for them to work in th_e classroom on this site.
Each of the lessons have questions with videos if the student needs additional help. The videos are great, too. You, as a parent, can go through and view the lessons and courses, too. I think that is a great idea so you can get a feel for how and what the child is learning.
Courses have been created for a multitude of subjects, including math, science, humanities, test prep, computer programming, and more! This isn't just for remediation, it can also be used to tap into something your child is interested in learning about.
Parents have a dashboard to assign courses and look through their child's progress. Such a great resource. Here are some ways you can use the math portion of the site -
With school starting, I would definitely keep this page bookmarked - there is a YouTube channel, too.
A teacher turned techie with an obsession with Google, teachers that love learning, and students that love life!