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 checking their work for mistakes.
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
Mathematical 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 and 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.
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 should introduce this activity with an explanation of quality and why catching errors is important. A simple video which can help explain this concept can be found here: https://youtu.be/ZpFqnefTGA8. Have students brainstorm different jobs and why quality would be important to that job.  T  10 minutes 
Students will work on one problem that has multiple steps. They should intentionally complete the problem incorrectly, but try to do it in a way that would make it difficult for a classmate to find their error. 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 Slip: List two ways you will pay attention to the quality of your work in the next week.
WrapUp:
Class discussion 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 to correct the problem in another pair's work.