Bellwork Change to Addition 1.) 11 - 3 2.) 7 - (-2) 3.) -6 - 9 4.) -3 - (-5) 5.) 7 -(-3) 6.) 5 - 2 7.) -6 -(-9) 8.) -3 - 5

Bellwork Change to Addition 1.) 11 - 3 2.) 7 - (-2) 3.) -6 - 9 4.) -3 - (-5) 5.) 7 -(-3) 6.) 5 - 2 7.) -6 -(-9) 8.) -3 - 5

Change to Addition and Simplify 1.) 16 - 9 16 + -9 = 7 2.) -12 -14 -12 + - 14 = - 26 3.) 27 -(-5) 27 + + 5 = 32

Change to Addition and Simplify 4.) -16 -|-25| -16 -25 = -16+-25 = -41 5.) -11 - 5 -11 + -5 = -16 6.) 2 - 6 -13 2 + -6 + -13 = -17

Change to Addition and Simplify 7.) -1/2 -1/4 -2/4 + -1/4 = -3/4 8.) 1/2 -1/4 2/4 + -1/4 = 1/4 9.) -1/2 -(-1/4) -2/4 + +1/4 = -1/4

Change to Addition and Simplify You don’t need to make the 2 marks if it is already + 10.) -5 - |12| -5 -12 = -5 + -12 = -17 11.) |-3| - |-3| 3 - 3 = 3 + -3 = 0 12.) 8 + -4 4

Change to Addition and Simplify 13.) |-7| - 9 7 + -9 = -2 14.) |6| - (-5) 6 + + 5 = 11 15.) 7 - 8 - 4 - (-2) 7 + -8 + -4 + + 2 = -3

Closure #1 To change subtraction to addition, How many marks do you always make? two

Closure #2 To change subtraction to addition, where do you make the marks? Between the 2 numbers

To be able to add and subtract Matrices. Today’s Objective To be able to add and subtract Matrices.

A Matrix This is a 2 by 3 Matrix. A matrix is a rectangular arrangement of numbers into rows and columns. 4 -2 9 0 3 -5 This is a 2 by 3 Matrix.

A Matrix 2 Rows and 3 Columns. 4 -2 9 0 3 -5

Adding Matrices 1.) -3 -2 6 -8 5 -7 -9 6 1.) -3 -2 6 -8 5 -7 -9 6 + = 3 -10 -4 -1 Add the Corresponding parts of each matrix.

Subtracting Matrices 1.) -3 -2 6 -8 5 -7 -9 6 1.) -3 -2 6 -8 5 -7 -9 6 - = -9 6 14 -13 Subtract the corresponding parts of each matrix.

Adding Matrices 4 -2 9 -1 0 0 3 -5 3 7 Matrices Cannot be added if they don’t have the same # of Rows & Columns +

You try these 1.) -3 -2 6 -8 5 -7 -9 6 2.) 3 -7 4 -3 7 -1 7 8 1.) -3 -2 6 -8 5 -7 -9 6 2.) 3 -7 4 -3 7 -1 7 8 3.) -5 7 -6 5 -3 -9 -1 7 + = = + = -

You try these 1.) -3 -2 6 -8 5 -7 -9 6 2.) 3 -7 4 -3 7 -1 7 8 1.) -3 -2 6 -8 5 -7 -9 6 2.) 3 -7 4 -3 7 -1 7 8 3.) -5 7 -6 5 -3 -9 -1 7 3 -10 -4 -1 = + 7 -10 14 7 = + 1 2 -2 -16 = -

You try these 4.) 0 -3 -6 0 -1 4 3 1 5.) 1 1 4 -3 1 1 7 0 6.) -5 7 5 -7 -3 -9 3 9 = - = - = +

You try these 4.) 0 -3 -6 0 6 -3 -1 4 3 1 -4 -2 5.) 1 1 4 -3 -3 4 4.) 0 -3 -6 0 6 -3 -1 4 3 1 -4 -2 5.) 1 1 4 -3 -3 4 1 1 7 0 -6 1 6.) -5 7 5 -7 0 0 -3 -9 3 9 0 0 = - = - = +

Classwork Do Worksheet 2.4 Homework: page 84 (5-18)