Includes bibliographical references and index.

"Understanding place value is the key to comprehending large numbers and to learning strategies to easily add and subtract such numbers. In this fun book, readers will practice place value skills presented by the monsters called ogres! Delightful illustrations and intriguing folklore fact boxes accompany the achievable text. Readers will also answer math problems throughout the motivating volume, allowing them to assess their understanding of the critical concepts"--,Provided by publisher.