Solving Addition Problems Using Compensation

  This is a lesson I taught earlier in the school year. It was something that I do not remember learning honestly. The topic is called compensation, and I taught my 2nd graders how to add using compensation. With compensation, I had to remind my students that if you add a certain number to one side of the equation, then you have to subtract the same number to the other side of the equation. 

Here is an example of some guided practice problems we did in class:

Guided Practice: Use Compensation to make numbers that are easier to add. Then solve. Show your work.

1. 17 + 9= 26                                        

     +3 -3

20+6=26

                                 

   2.  16+14=30

    +4    -4

20+10=30

I used the different colors to differentiate the problem and explain the steps of the problem. Overall, reflecting on this lesson I think that my students understood this lesson well. 

 I used the EnVision Mathematics Grade 2 workbook, Topic 3 lesson 4 for this lesson.  (I could not attach a screenshot of any in class work or student work this time due to there being a glitch on the website with uploading pictures right now)

New York State Next Generation Mathematics Learning Standards: NY-2.OA: Represent and solve problems involving addition and subtraction. 1b: Use addition and subtraction within 100 to develop an understanding of solving two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions. 

Common Core State Standards For Mathematics: Standard for Mathematical Practice: 1. Make sense of problems and persevere in solving them.