This is a set of textbooks and answer keys to deepen your understanding of mathematics. - Title: 4-Step Mathematics II + B - Type: Textbook - Title: 4-Step Mathematics II + B Answer Key - Type: Answer Key Thank you for looking. The books are in good condition with only the previous owner's name written on them, and no folds or writing inside. The name on the answer key was written in pencil, so it has been erased. The name on the other book was written in pen, so it has been corrected with correction tape.