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The modules are written for teachers. They provide the mathematical background to help teachers plan the development of topics in their classrooms. This module is related to Module 24: Number and Algebra: negatives and the index laws in algebra - teacher guide, Module 23: Number and Algebra: algebraic expressions - teacher guide, Module 26: Number and Algebra: linear equations - teacher guide and Module 32: Number and Algebra: fractions and the index laws in algebra.