04/11/23©Evergreen Public Schools

2010

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Compare Strategies

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Practice 3: Construct viable arguments and critique the reasoning of others

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3

CF1b I can solve a 2-step equation.

What do you know about equations?

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4

LaunchLaunchLaunchLaunchSolve:

3x + 15 = 24

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5

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Marsha and Tara each solved the equation 3x + 15 = 24 differently.

Marsha and Tara each solved the equation 3x + 15 = 24 differently.

Marsha3x + 15 = 24

3x = 9

x = 3

Tara3x + 15 = 24 x + 5 = 8 x = 3

Who’s strategy is correct?

Vote with your feet!

Go to the corners.

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7

Are both strategies correct? How do you know?

Are both strategies correct? How do you know?

Marsha3x + 15 = 24

3x = 9

x = 3

Tara3x + 15 = 24 x + 5 = 8 x = 3

Describe each girl’s strategy.

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8

Use both strategies to solve these problems.

Use both strategies to solve these problems.

•2x – 8 = 14

•5x + 7 = 42

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DebriefDebrief

When is Marsha’s strategy better?

When is Tara’s strategy better?

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5

3

12

4

Did you hit the target?

CF1b I can solve a 2-step

equation.

Rate your understanding of the target from 1 to 5.

5 is a bullseye!

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PracticePractice

Practice Two Step Equations CF.0.___

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12

Ticket Out

Solve

5x + 15 = 50