Understanding the principles of base ten is essential to understanding numbers and operations. Students will become familiar with the concept of place value through engaging narratives and real-life situations. Students will then be challenged to use place value in the context of algebraic operations, demonstrating the knowledge they’ve gained from reading. Eye-catching visuals help walk readers through the math problems, while age-appropriate language encourages learning. Readers will gain a deep understanding of adding and subtracting three-digit numbers as they learn about animal migrations around the world. This volume meets CCSS Math Standard 2.NBT.B.7.