Lesson 25

Solve a 2-step linear equation involving decimals

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SWBAT solve 2-step linear equations involving decimals.

Big Idea

Students will draw heavily on mathematical practices 1,2,5,and 6 to solve 2-step linear equations involving decimals.

Teacher Guided Notes

Bell Ringer

10 minutes

Have students sit in their Individual Think Time seats.  Students will be handed the bell ringer as they walk in the door.  Students are to get started on the bell ringer right away with no talking.  Students will have an opportunity to work with their peer groups during the student activity section.  Students will be given 10 minutes to grapple through the bell ringer on their own.  Students should show their work on each problem and be prepared to defend their answers.  If students are unable to answer the problems, have the students write what they do not understand.  Students are not allow to write I don’t know any of it.  Students must write specific questions that will help their peers and you to help them through what they do not understand.  It is helpful to walk the room to check for understanding.  For students who may struggle be sure during this time you encourage them to write why. 

Student Activity

10 minutes

After students have worked for 10 minutes on their own, have the students pair up with a peer or group.  Students should discuss what they were able to accomplish, what they did not understand, and how they were able to solve the problems.  What strategies did they use?  What in the problem gave them trouble?  The pairs or groups should share out for 10 minutes.  During this time you will be able to engage with the groups through effective questioning.  Depending upon where the student struggles, will depend upon your questioning. You are an awesome educator and you know your students better than anyone.  Use questioning that will evoke further thinking and not yes or no questions that will give them the answer.  

Whole Group Discussion/Direct Instruction

15 minutes

During this time you will be able to allow students to share out their thinking with the whole group.  Post the assignment on the smartboard, document camera, or other means for the whole group to see the assignment.  During this time students are able to share out how they solved the problem.  You may have the student come to the smartboard and work out the problem while he or she explains their strategy, or they may talk through the process they used to solve the problem and you can write what they are explaining.  During this time the rest of the group will critique the work of the students sharing out.  Did anyone else solve the problem the same way?  Does everyone agree with the way the student solved the problem, if not why?  Did anyone else get the same response, but solve the problem in a different way?  During this time it is important that students are able to share out their thinking whether correct or incorrect.  This will allow you to understand how your students are thinking.  It is important to validate correct thinking and correct mistakes made.  This time period is a time in which direct instruction will also take place.  You will allow students the opportunity to share their thinking, and also go through the correct process in solving the problems

Closing/Exit Ticket

5 minutes

This is the time in which you will summarize your lesson.  You will go through the important emphasis of the lesson.  What did you want your students to be able to do once the lesson concludes?  How will you know they gained the understanding you wanted them to gain?  Exit tickets are a great way to formatively assess if students understood the objective of the lesson.  


Included are extra equations for students to practice to gain mastery.