When Sir Cumference drinks a potion which turns him into a dragon, his son Radius searches for the magic number known as pi which will restore him to his former shape. Everyday Mathematics Interest Level: 3-6 Reading Level: 5.1 ATOS Book Level: 3.8 AR Interest Level: LG AR Points: .5 AR Quiz: 41650EN Reading Counts Level: 4.2 Reading Counts Points: 3 Lexile Measure: 510 Lexile Code: AD (Adult Directed) Fountas & Pinnell: Q.