Unit 4 - AlgebraExpressions and Equations- Lesson 2Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Let’s take a look at the vocabulary that we will use to describe our thinking in Algebra!

• C:\Users\pthompson\Desktop\Math Department\Assessments\Unit 4 (Algebra)\Tier 2 Words for Unit 4 in 7th Grade Math.docx

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

You might want to remember this! ;-)

What is Algebra?Why is “X” used as the unknown?

• http://www.youtube.com/watch?v=YX_OxBfsvbk

• http://www.youtube.com/watch?v=_pEQiUSu62I

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Game Time! Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Why is it important to come to a certain agreement on procedural rules (in sports/games, language, mathematics)?

Turn and Talk!

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Expression-Let’s take a look

Expression

• Expression- A number or combination of numbers and symbols that stand for a value

Examples of expressions

• 5x – 3• 2 + 2• B• 5• 7-x• 18a• 25÷5

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Now that we know what expressions are, let’s learn how to evaluate them… but what does it mean to evaluate something?Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Evaluating is easy!

Evaluate

• Evaluate- To look at information or facts and make a decision based on the information given

Example of evaluation

• b= 5

• b – 3

• When I evaluate this expression I see that the expression is 2, because b=5 and 5-3 is 2

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Now you try!

Evaluate Answer:

17b= 7

b + 107

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

In-Class assignment…

• 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.

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Exit Ticket…

• 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…

Objective: Students will learn to evaluate an expression by substituting a variable with a known value

Objective: Students will learn to evaluate an expression by substituting a variable with a known value