The "Primary Mathematics 1A - Home Instructor's Guide" by Singapore Math Inc. is a comprehensive instructor guide specifically designed for teaching elementary school level mathematics. Published in 2007, this paperback book focuses on the subject area of mathematics and is written in English. With a beginner level approach, this guide is perfect for home instructors looking to help students develop a strong foundation in mathematics. Authored by Singapore Math, this publication is an essential tool for those seeking to enhance their students' understanding of mathematical concepts.