Essential Mathematics for Cambridge Lower Secondary has been created for the international student. Written by an expert author team with an experienced examiner, it provides complete coverage of the latest Cambridge syllabus. The Essential Mathematics for Cambridge Lower Secondary series has been created for the international student. Written by an expert author team with an experienced examiner, it provides complete coverage of the latest Cambridge syllabus. The Stage 9 Workbook supports and supplements the Stage 9 Student Book, with engaging exercises to support the curriculum framework. It provides summary notes for the theory required, extra questions for students to practice and apply the skills and knowledge they have gained, and space for pupils to write their answers in.