The modules are written for teachers. They provide the mathematical background to help teachers plan the development of topics in their classrooms. It relates to Module 23: Number and Algebra: algebraic expressions - teacher guide, Module 25: Number and Algebra: special expansions and algebraic fractions - teacher guide, Module 26: Number and Algebra: linear equations - teacher guide and Module 32: Number and Algebra: fractions and the index laws in algebra - teacher guide.