Chewing gum has been around for thousands of years. But bubblegum has a more recent history. Many people think that bubblegum and chewing gum are the same thing when in fact, they are quite different! Learn about the fascinating history of gum as you practice addition and subtraction! This math reader builds literacy skills and math content knowledge, combining informational text, problem-solving, and real-world connections to help students explore math in a meaningful way. The Let's Explore Math sidebars feature clear charts and diagrams that make learning the concepts easy and fun. The Problem Solving activity enhances the learning experience and promotes mathematical reasoning, and the Math Talk section provides critical thinking questions to help facilitate rich discussions while developing students' speaking and listening skills. Text features include content-area vocabulary, dynamic images, a table of contents, a glossary, an index, and an answer key. Aligned to state and national standards, this high-interest e-book will engage students in reading and learning.