A companion activity guide to theSir Cumference series of math adventures.

Sir Cumference and Lady Di have to figure out a quick way to count the guests to bring order to the party.

"Children will enjoy the lesson built into this tale and identify with the birthday-party theme. "
--School Library Journal

Sir Cumference, Lady Di of Amter, and Radius are back in their second Math Adventure! This time, a potion has changed Sir Cumference into a fire-breathing dragon. Can Radius change him back?

Join Radius on his quest through the castle to solve a riddle that will reveal the cure. It lies in discovering the magic number that is the same for all circles.

King Arthur and his knights use different geometry concepts to solve various problems.

On a quest to earn his knighthood, Radius uses different geometry concepts to find and rescue a missing king.

When young Per visits her uncle Sir Cumference, aunt Lady Di of Ameter, and her cousin Radius, they teach her how to play Inners and Edges. After Per finds a clue linking the game to the mysterious castle of the Countess Areana, she and Radius sail to the island of Immeter. There, they have to decipher cryptic clues while avoiding a sea serpent. To unlock the island's secret, Per has to figure out how to find the perimeter and area of a circle. Only then can she become Per of Immeter.

Coming August 2013

The ninth book in the popular Sir Cumference series, Sir Cumference and the Off-the-Charts Dessert introduces readers to different methods of collecting data.

King Arthur has issued a challenge. The first knight to find the sword, Edgecalibur, will be the next king. Sir Cumference, Lady Di of Ameter, and Radius help their friend, Vertex, find the sword.