This chapter explains why numbers are important, both in society and in business. It reminds you about negative numbers and explains how to add, subtract, multiply and divide them and how to use brackets. It explains how to make rough estimates before using a calculator and how to round numbers. It goes on to describe how symbols can be used to represent general relationships between quantities and shows how symbols can be treated in a very similar way to numbers. It introduces the idea of a model and explains what a spreadsheet is.
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