Darlene Misconish Tyler 
Your World: Bubblegum [PDF ebook] 
Addition and Subtraction

It is gooey and sweet, a delicious, chewy treat. It is bubblegum! Come along as we smack, blow, and pop our way through addition and subtraction! Students will develop their math skills while engaged in reading about the fascinating history of gum. This nonfiction math book combines math and literacy skills, and uses real-life examples of problem solving to teach subject area content. The full-color images, intriguing sidebars, practice problems, and math diagrams make learning arithmetic concepts relevant and fun. Text features include a table of contents, glossary, and index to increase understanding of math and reading concepts. An in-depth problem-solving section provides additional learning and practice opportunities while challenging students’ higher-order thinking skills.