This answer key provides the answers for the textbook and workbook problems in Singapore Math's Primary Mathematics, Standards Edition series, from book 1A-3B. Exercise and Practice numbers are clearly labeled with the page numbers provided. Answers are line-listed, with graphical representations (i.e. graphs) where needed. 84 pages, softcover. Please note that these answers are found in the sold-separately home instructor's guides/teacher's guides for each level.