When Number 4 jumps into Flatland, he becomes a square. Meet the rest of the shapes by counting the sides.

Number 12 sings about the different shapes and arrays that they can become.

Number 6 shows his friends the sides of his dice and the shapes their friends can make.

Monster Math Squad determines how many sides does a triangle, square, and pentagon have.

Numbers 10 and 9 help an alien build a tower all the way to space.