Due to the size of the videos slowing down the website, I'm going to provide a few links to the websites I think will be most helpful to you. Each has a "playlist" on the right side where you can choose the specific lesson.
Lesson 4
Partial Products
Lesson 16
Long Division
2 digit x 2 digit (area model/partial products)
2 digit x 2 digit (standard/turtlehead)
Factor Rainbows
Finding Factor Pairs