Primary Mathematics 4B SET--Textbook and Workbook

We love Singapore math for our homeschool. I was disappointed to find out that this set did not contain the answer key! I’m not sure how to obtain one either. I will go back to ordering directly from the My Father’s World page.

The math books themselves are great. However, I was under the impression that they were in new condition when I ordered them. I was disappointed to open the workbook and see at least 20 pages already written in with pen! Nowhere in the description was this described as a used set. I’m disappointed and am going to return it.