Ch 3_Student_Edition.pdf - Algebraic Expressions and...

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Algebraic Expressionsand Properties3.1Algebraic Expressions3.2Writing Expressions3.2Writing Expressions3.3Properties of Addition and Multiplication3.3Properties of Addition and Multiplication3.4The Distributive Property3.4The Distributive Property5643211012864215181296320 2416128425 30201510530 3624181261234565643215643211012864215181296320 2416128425 30201510530 362418126123456564321“Did you know that 5365635,but 546Þ645?”“Only certain operations like additionand multiplication preserve equalitywhen you switch the numbers around.”“Descartes, evaluate this expressionwhenx52 to determine the number ofcat treats you are going to eat today.”“Remember that you evaluate analgebraic expression by substitutingthe value ofxinto the expression.”3.1Algeb3.1Algeb3lb3.1Algeb3
Interpreting NumericalExpressionsExample 1Write a sentence interpreting the expression 3×(19,762+418).i3(19 762418)x01244 +x56“Great! You’re up tox= 2.Let’s keep going.”What YouLearned Before
Example 2Write a sentence interpreting the expression (316+43,449)+5.
Example 3Write a sentence interpreting the expression (20,008752)÷(20,008752)÷2 is half as large as 20,008752.Write a sentence interpreting the expression.2.+4086)+100+564)÷33441220÷537324
110Chapter 3Algebraic Expressions and PropertiesAlgebraic Expressions3.1Work with a partner.a.You babysit for 3 hours. You receive $12. What is your hourly wage?Write the problem. Underline the important numbers and units youneed to solve the problem.Read the problem carefully a second time. Circle the key word forthe question.Write each important number or word, with its units, on a piece ofpaper. Write+,,×,÷, and=on five other pieces of paper.Arrange the pieces of paper to answer the key word question, “What isyour hourly wage?”Evaluate the expression that represents the hourly wage.hourly wage=÷Write.=Evaluate.So, your hourly wage is $per hour.b.How can you use your hourly wage to find how much you will receive forany number of hours worked?ACTIVITY:Reading and Re-Reading1How can you write and evaluate an expressionthat represents a real-life problem?You babysit for 3 hours.You receive $12.What is your hourly wage?hourly wage ($ per hour)Algebraic ExpressionsIn this lesson, you willuse order of operationsto evaluate algebraicexpressions.

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Term
Spring
Professor
Jones
Tags
The Distributive Property, Addition, Multiplication, Algebraic Expressions, Algebraic Expressions and Properties

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