The material in this appendix describes the use of numbers, to include addition, subtraction, multiplication, division, order of operation, exponents, rounding, significant digits, and decimal places. Each math concept is developed by a text description with a graphic illustration and sample problem with a detailed solution. In
addition, exercise problems to use your new skills are provided. Answers to these exercises are provided in appendix C.
This section includes a review of a few key facts about numbers. Numbers continue in both
the positive and negative directions forever. See figure B.1. This is shown as a line with arrows pointing in both
directions, extending on to infinity. The numbers to the right of the zero are called positive and the numbers to
the left are negative.
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B Developmental Units 
