Videos can show students visually how to solve problems but also how to see math concepts differently. Sometimes just seeing or hearing something repeatedly will increase the understanding of those concepts. Below are some different sites: This is one of the most popular YouTube channels that offers free video lessons and tutorials on a wide range of subjects including Math. You can also access more Math content, activities, and exercises on their website.
This is a games that has different monster characters that students start at a basic level and then try to defeat an opponent, as they keep answering questions it increases their level in math so it is a good place to start to see what grade level you are at and what skills you need to work on.