Adding and Subtracting Matrices

Adding and Subtracting Matrices – Using Rainbows

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This is the most important lesson in the Unit on Matrices! The easiest way to teach adding and subtracting matrices is by color coding.
 

Let's Start Adding and Subtracting Matrices

I start with adding two 2x3 matrices. The reason I do not start with 2x2 matrices is because it is easier to show them that the matrices must be the same size to add or subtract them. 
 
 
The other reason I use 2x3 matrices is because that means there will be 6 numbers inside each and there are 6 colors to the rainbow (I know that's debatable but for the sake of the lesson go with it).
 
Red - Orange - Yellow - Green - Blue - Purple
 
Each number from the first matrix gets matched with its Corresponding number in the second matrix. Then they are added or subtracted. I do this with a group activity.
 
Click Here to Download a Sample Set of Cards for the Activity: Adding and Subtracting Matrices - Using Rainbow Cards
 
Cards like the ones below are passed out to small groups and they find the solutions. The rest of the activity is available if you are a Algebra 2 Teacher Community Member: Click here to Join Now!
 
Here are two cards I use to introduce the lesson...
 
adding-matrices
 
I always start with addition. Simply because it is easier.
 
subtracting-matrices

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4-2 Small Group Activity - Adding and Subtracting Matrices - Rainbow Cards (FREE)

4-2 Assignment - Adding and Subtracting Matrices (FREE)

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4-2 Exit Quiz - Adding and Subtracting Matrices (FREE)

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4-2 Guided Notes Teacher Edition -  Adding and Subtracting Matrices (Members Only)

4-2 Lesson Plan - Adding and Subtracting Matrices (Members Only)

4-2 Online Activities - Adding and Subtracting Matrices (Members Only)

4-2 Slide Show - Adding and Subtracting Matrices (FREE)

 

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Adding and Subtracting Matrices worksheet
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