Singapore Math Challenge Primary Math Workbook (Homeschool Math) Excellent Cond The Singapore Math Challenge Primary Math Workbook is a comprehensive resource for homeschooling students in grades 3 and higher. Authored by Terry Chevs and published by SAP, this workbook focuses on algebra and mathematics concepts at an intermediate level. With a teacher’s edition available, this workbook provides a structured approach to learning and problem-solving in English language. The ring/wire bound, trade paperback, flexi bound, and paperback formats make it versatile for different learning styles and preferences.