February 2014
Beginner
384 pages
6h 58m
English
Content preview from Basic Math and Pre-Algebra For Dummies, 2nd Edition
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Chapter 5
A Question of Values: Evaluating Arithmetic Expressions
In This Chapter
Understanding the Three E's of math — equations, expressions, and evaluation
Using order of precedence to evaluate expressions containing the Big Four operations
Working with expressions that contain exponents
Evaluating expressions with parentheses
In this chapter, I introduce you to what I call the Three E's of math: equations, expressions, and evaluation. You'll likely find the Three E's of math familiar because, whether you realize it or not, you've been using them for a long time. Whenever you add up the cost of several items at the store, balance your checkbook, or figure out the area of your room, you're evaluating expressions and setting up equations. In this section, I shed light on this stuff and give you a new way to look at it.
You probably already know that an equation is a mathematical statement that has an equals sign (=) — for example, 1 + 1 = 2. An expression is a string of mathematical symbols that can be placed on one side of an equation — for example, 1 + 1. And evaluation is finding ...
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