As a young boy in medieval Italy, Leonardo Fibonacci thought about numbers night and day. He was such a daydreamer that people called him a blockhead. However, when he grows up, he becomes a brilliant mathematician who discovers the Fibonacci sequence. Full color.

Reviews

"Charming and accessible..."--"The New York Times Book Review"* "The lively text includes touches of humor; Emperor Frederick called him 'one smart cookie.' O'Brien's signature illustrations textured with thin lines re-create a medieval setting."--"Kirkus Reviews, "starred review "Math lover or not, readers should succumb to the charms of this highly entertaining biography of medieval mathematician Leonardo Fibonacci."--"Publishers Weekly" "D'Agnese's introduction to medieval Europe's greatest mathematician offers both a coherent biographical account--spun, with some invented details, from very sketchy historical records--and the clearest explanation to date for younger readers of the numerical sequence that is found throughout nature and still bears his name."--"Booklist"

"This lighthearted introduction to Fibonacci's ideas will inspire young math lovers and perhaps point them toward more scholarly explorations."--"School Library Journal"

"[An] engaging, kid-friendly look at Fi