Check out the Common Core with a collection that represents all the 8th grade math standards. Most resources engage multiple standards but the main one is listed on the notes section of each tab. 

Understand the idea of proportionality by looking at it through a graph. This series of LearnZillion videos introduces the idea of the graph and then figures out more information as the videos go on. The final video has learners answer questions based off a graph. 

The ratio is a great skill to teach young scholars because it can solve a variety of problems. See how ratios are solved through different methods in each of the following videos brought to you by LearnZillion.