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Evaluating expressions involving numbers is one of the basic tasks in arithmetic. If an expression is complicated then it may not be clear which part of it should be evaluated first andso some rules must be established. There are also rules for calculating with negative numbers. After reading this text you should be able to: evaluate an arithmetic expression using the correct order of precedence; add and subtract expressions involving both positive and negative numbers; multiply and divide expressions involving both positive and negative numbers.

Launch Rules of Arithmetic

Decimals and Significant Figures

Unit looking at significant figures decimal places and irrational numbers.After reading this text you should be able to:multiply and divide a decimal by powers of ten; convert decimals into fractions and vice versa; round a decimal number to a given number of decimal places or to a given number of significant figures.