What is subtraction, and how does it work? With the character Subtraction as their guide, readers will count peaches, worms, and train cars to find out! Through bright and colorful comic-book-style pages, kids will have fun discovering basic subtraction strategies, such as mental visualization and problem writing. A helpful table and a list of additional resources are featured in the back of the book. Building Blocks of Mathematics is a fun series of mathematics books from World Book! Quirky characters introduce basic mathematics concepts in this six-volume series of books. Story problems help students with a primary reading level of 3 through 5 develop a fundamental understanding of mathematical operations and teach them techniques for solving real-life math problems. Designed in collaboration with elementary mathematics education experts, this series is appropriate for kids who are just beginning to learn math concepts, as well as older readers who can benefit from review and reinforcement.