Works with LeapReader Reading & Writing System Join a group of creative children as they use writing, science, technology, engineering, art and mathematics skills to design signature cars for the Soap Box Derby. By working together and sharing resources, the budding engineers build amazing cars and awesome new skills, too! Features • Use science, technology, engineering, art and math skills to design signature cars for the Soap Box Derby. • Interactive workbook features play-based learning activities: number writing, engineering vocabulary, mathematics mazes and more! Also includes Practice Pack with extra mess-free LeapFrog™ Learning Paper. • Teaches: design process, engineering basics and solving equations. • Ages 4-8 years. • Works with LeapReader™ reading system (sold separately). Learning Difference As children explore LeapReader books, parents can connect LeapReader to their computer and expand the learning with fun, free activities, printables and tips from experts that reinforce their school skill set. You’ll be able to see their reading progress and get personalized skill insights. Works only with LeapReader™ Reading and Writing System.