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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

Study guides in straight line relationships using y = mx + c using SLOPE and INTERCEPT using Excel for linear regression in science uncertainty in calibration calculations linearization and linear calibration in science

Statistics for Chemists - A Basic Study Guide

Identifies the key topics that provide an understanding of the basic statistics relevant to chemistry - you can then look up these topics, either on-line or in textbooks on basic statistics,

Decimals and Significant Figures - Video

Video demonstrating decimals significant figures and irrational numbers.

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.