This is my submission for the MakerBot Academy challenge, the MultiBoard (Multiplication Board). It is a board that has holes where students and teachers can place the included semi-sphere pegs, and labels for the numbers. You take the included two .stl files, print them, and place the pegs in a square that is where the two numbers meet to 1x1. For instance, you could multiply 5x8. You would first find where 5 and eight meet, and fill in all the squares from the NW corner. This board goes from 8 (vertical) to 12 (horizontal).
Print with no supports, and raft if you need to (based on prior prints).