Pdf’s are Adobe Acrobat documents. They were the first formatted ebooks and are used even today to share books and other document data. As a 4th grade teacher, all my texts I teach from have some form of pdf copy. This is helpful to me because I can make copies on the fly for selective lessons or homework. In short, pdf’s rock!
If you’ve ever needed copies from a textbook but didn’t have the time to use a copy machine, you’ll understand the value of a pdf. Scour your teacher resources for these and even if you don’t find them there, you can search with this Boolean method on Google: “Scott Foresman file type:pdf” (omit quotation marks). It will show you some often incredibly helpful results, free for the taking.