Math Lessons for a Living Education: Level 4 teaches math concepts through engaging, real-life stories and practical application. This award-winning homeschool math curriculum series uses a story-based approach. In Level 4, a summer spent in Peru has meant a lot of changes for Charlie, Charlotte, and their growing family! Your student joins them as they see new sights on a family trip, explore the role math plays in their adventures, develop important character traits, apply critical thinking skills, and discover how mathematical concepts interact with the world around them.