Elementary-level maths becomes an exercise in fun when children open this humorous, cartoon-illustrated fantasy. As students enjoy the stories, they encounter one maths word problem after another, and they learn to think, calculate, and come up with the right answers. Mayor Lostis Marbles is back again, looking for problem-solving help. This book's superhero and problem solver is the fifteen-year-old, skateboard-riding Kent Clark, also known as Edge Master. He helps the mayor fight the underworld Shiftless gang. In the process, they solve problems involving angles, polygons, triangles, quadrangles, squares, prisms, and pyramids.