Germs are everywhere. They're on your hands, your school supplies, and even in your mouth! With this engaging book, students will learn to write, simplify, and evaluate algebraic expressions to explore how fast germs can spread. With vibrant photos, math charts and diagrams, grade-appropriate text, and informational text features to help navigate the text, students will learn practical, real-world applications of math skills as they learn new mathematical concepts and build their STEM skills.