Sarah Machajewski 
Animals on the Move [PDF ebook] 
Use Place Value Understanding and Properties of Operations to Add and Subtract

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.