Zahlenzorro - Das Heft Basisheft 4 Mathematics with favourite topics like circus, fantasy, detectives or pirates. This is now possible with the new Zahlenzorro booklets. The Zahlenzorro Basis Booklet 4 contains the complete fourth grade material for independent learning, practicing and deepening - at school or at home in the afternoon. Self-explanatory and independent of the textbook, the Basic Booklet 4 on the topic "Pirates and Sea Worlds" motivates the children throughout the entire booklet. The tasks are embedded in stories about pirates and treasures, islands, ships, whales as well as marine researchers and divers. The Zahlenzorro is always present, accompanying the pupils with questions and assistance. A removable solution booklet serves children, parents and teachers to check the results quickly and safely. Al.