Ready-to-Go Lessons THE MAILBOX® Books Choose from 77 easy-to-implement, curriculum-based lessons that are set to go in minutes! With complete lessons for language arts, math, science, and social studies, you'll have a wealth of skill-based ideas to reinforce your curriculum in one easy-to-use resource! 320 pages. Each lesson includes Preparation tips A complete materials list Background information Lesson introduction Step-by-step instructions Reproducible activity or pattern Extension activities