Set of 3 calculation drill books. As shown in the image, there are marks such as circles, which will be erased with an eraser before shipping. There are no writings in the answers. Only the answers for the third term are missing. There is some writing by a child in a part of the answer key, but it's not so much that the answers are unreadable. How about using them for previewing and reviewing lessons? - Title: Repeated Calculation Drill - Number of books: 3 - Target age: Grade 2 - Contents: Table of contents included Thank you for looking.