Check Your work
Title: Check Your Work  Author: Nick Schaumberg 
Subject(s): Math  
Grade Level(s): 612  Total Time: 50 Minutes 
Overview / Description:
This lesson will help students understand why it is important to check their work after they complete a math problem. They will be searching other students' work to find a mistake in the work they completed.
Learning goals/objectives:
After completing this activity, students should be able to . . .
 check their work.
 explain their work.
 understand the importance of quality control.
Workplace Readiness Skill:
Social Skills  x  Communication 

x  Teamwork  x  Critical Thinking 
Attitude and Initiative  Planning and Organization  
Professionalism  Media Etiquette 
Content Standards:
Wisconsin Standards for Mathematics
Math Practices
Make sense of problems and persevere in solving them.
Construct viable arguments and critique the reasoning of others.
Attend to precision.
Algebra » Reasoning with Equations & Inequalities
CCSS.MATH.CONTENT.HSA.REI.A.1
Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.
Educational Frameworks:
BLS 1. Demonstrate criticalthinking
skills to make informed decisions
BLS 9. Gather evidence and consider
multiple perspectives to make
informed decisions
Materials:
 This can be used with any type of solving unit. I will be using this in my Tech Math class in our solving equations unit.
 The teacher should have enough problems for one for each student. Multiple students could solve the same question.
 Quality control video
Learning Activities:
WHO (T=Teacher Focus Lesson; WG=Whole Group\; SM=Small Group; I=Independent)
Learning Activity Task  WHO is responsible for this step?  Approximate time for task 
Teacher will start the lesson by discussing the importance of quality control and checking your answers. Have students brainstorm types of jobs and why quality control would be important in that job. Teacher may used a video such as Quality control video to emphasize this point.  T  10 minutes 
Each student will work on one problem that has multisteps (a different problem for each student). They should complete the problem incorrectly, but work on making the error difficult to find easily. They should also check their work.  I  10 minutes 
Students get into groups of 34 and trade papers. Students will try to find where the original student went wrong. Once they find the error, students will fix the problem.  SG/I  10 minutes 
Once all students are done, each student will explain where the error occurred and how they changed it to find the correct answer.  SG  15 minutes 
Wrap up discussion on why is checking your work important.  WG  5 minutes 
Assessment:
 Teacher will collect the papers that have been completed and check over what the students completed.
 Exit ticket: List two ways that you will practice quality control this week.
WrapUp:
Class discussion about why checking your work is important.
Extension Activity (for intervention or enrichment):
 Students could video their response and where they found the mistakes.
 Differentiation: students could work in pairs to create an incorrect problem and find another pair to exchange and correct problems
 Teacher could invite in a guest speaker to discuss quality control in a particular industry.