When a young child decides to build a fort in the backyard, Grandpa comes forward to help. But they can’t do it alone—they get help from the six simple machines: lever, pulley, inclined plane, wheel and axle, screw, and wedge. Told in cumulative rhyme, similar to The House That Jack Built, readers follow the building process to completion and discover the surprise reason it was built.

This individual eBook App will read-aloud in both English and Spanish with manual or auto page advance. Switch language any time and the page text changes and the reading restarts on the same page with your newly selected language.

The Fort on Fourth Street: A Story about the Six Simple Machines is designed to be both a fun-to-read story and a launch pad for discussion and learning. It features a 4-page For Creative Minds educational section in the back. And, through the "More.." button on the navigation bar, you will find a 34-page cross-curricular Teaching Activity Guide (includes 3 coloring pages available for printing on our website), 3 interactive quizzes (Reading Comprehension, For Creative Minds, & Math Word Problems), a page of Related Websites (linked with parent gate) for further study, and a short trailer.

There is also an optional login feature (on the navbar with parent gate) so that you can view The Fort on Fourth Street: A Story about the Six Simple Machines on your computers (login through our homepage), androids (new App available in March), and other devices). The login also enables eBook access though our free Fun eReader App and consolidation with other Arbordale titles.