This is the Teacher's Guide for homeschoolers using Singapore Math for 2nd grade.
(from the preface) "This manual is meant as a guide for instructors using Primary Mathematics 2A when teaching one student or a small group of students. It contains notes to the instructor, answers to the course book learning tasks, practices, and reviews, answers and solutions to the workbook exercises and revisions, and optional activities, games and discussions to use in presenting the concepts. There are replacement pages using US currency and mental math pages. ..."