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# Unit 4 lesson 2

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### Unit 4 lesson 2

1. 1. Unit 4 - AlgebraExpressions and Equations- Lesson 2Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
2. 2. • C:UserspthompsonDesktopMath DepartmentAssessmentsUnit 4 (Algebra)Tier 2 Words for Unit 4 in 7th Grade Math.docx Let’s take a look at the vocabulary that we will use to describe our thinking in Algebra!Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
3. 3. Why is “X” used as the What is Algebra? unknown? • http://www.youtube.com/ • http://www.youtube.com/ watch?v=_pEQiUSu62I watch?v=YX_OxBfsvbk You might want to remember this! ;-)Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
4. 4. Game Time!Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
5. 5. Turn andWhy is it important to Talk!come to a certainagreement on proceduralrules (in sports/games,language, mathematics)?Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
6. 6. Expression Examples of expressions• Expression- A number • 5x – 3 or combination of • 2+2 numbers and symbols • B that stand for a value • 5 • 7-x • 18a • 25÷5Expression-Let’s take alookObjective: Students will learn to evaluate an expression by substituting a variablewith a known value
7. 7. Now that we know whatexpressions are, let’slearn how to evaluatethem… but what does itmean to evaluatesomething?Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
8. 8. Evaluate Example of evaluation • Evaluate- To look at • b= 5 information or facts and make a decision based on • b–3 the information given • When I evaluate this expression I see that the expression is 2, because b=5 and 5-3 is 2 Evaluating is easy!Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
9. 9. Evaluate Answer: b= 7 b + 10 7 17Now you try!Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
10. 10. • Work independently to complete the in-class work on Evaluating Expressions• Your teacher will monitor your progress while you work• When you finish, please work on Math Minutes, Complete corrected homework, or Read your choice book• Do Not raise your hand. Look at your notes for help or skip the question and work on a different question until your teacher comes to your desk.In-Class assignment…Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
11. 11. • What is something that I learned in today’s lesson that I didn’t know how to do that I now know how to do?• I wonder…Exit Ticket…Objective: Students will learn to evaluate an expression by substituting a variablewith a known value
12. 12. Objective: Students will learn to evaluate an expression by substituting a variablewith a known value