THINK THROUGH LEARNING: $5.6 million to Pittsburgh, PA-based Think Through Learning in a Series B Round with SJF Ventures participating. (The company was founded in 2002 as Apangea Learning and had also raised a $4.2 million Series B round in May 2011.) It is best known for its Think Through Math (TTM) platform that delivers adaptive math content for grades 3 through Algebra I. According to the press release, over two million students in 42 states are on the program. Here's our in-depth look at TTM.