Write, simplify, and evaluate algebraic expressions to explore how quickly germs can spread! This informative title teaches children all about germs and how they spread, encouraging healthy habits, while allowing them to practice algebraic expression, exponential form, and distributive property. With eye-catching images, easy-to-read text, related practice problems, clear mathematical diagrams, STEM themes, and an accessible glossary and index, this book gives readers the necessary tools to feel comfortable writing, simplifying, and evaluating expressions!