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Wednesday, January 8, 2014

Joanna's Scribe Post

Subtracting Integers
2 0 1 4

♫ Whenever something is not there,
You must add a zero pair! 

             Whenever you're subtracting integers, you may see these types of equations...

6 - (-9) =            (-2) - (-5) =            6 - 7 =          -4 - 6 = 

Everything is combined but subtracting. You must remove when it's an equation with 2 negatives. 

6 - (-9) =        or       (-2) - (-5) = 

Instead of saying, have six and owe 9, you say, have 6 REMOVE owe 9. The positive always stays behind. If you find 2 negatives together, you always have more than what you're owing. For this question, instead of combining have 6 and owe 9, we remove the negatives. By doing so, we add zero pairs. Like this...

6- (-9) = 15
Have 6 remove owe 9 = have 15

            Step 1                 Step 2               Step 3                     Step 4    
              (-9)                Remove         +++++++++         +++++++++ ++++++    =     15
      +++++++++              -9            Add it with your             
      - - - - - - - - -       - - - - - - - - -   positive number

For this next equation, we do the same thing but instead of starting with a positive and a negative number, they will both be negative.

(-2) - (-5) = 3
Owe 2 remove owe 5 = have 3

            Step 1                 Step 2               Step 3                         Step 4    
              (-5)                 Remove            +++++                      ++ +++   = 3 
            +++++                  -5        Combine it with your         - - 
            - - - - -               - - - - -       negative number

These next equations will be different from removing. The next equations will not have 2 negatives together meaning that you'll combine without removing. 

6 - 7 =         or        -4 - 6 = 

6 - 7 = -1
Have 6 and owe 7 = owe 1

              Step 1                                          Step 2           
           ++++++          = -1                 Remove all zero 
           - - - - - -    -                      pairs and take what is left.

-4 - 6 = -10
Owe 4 and owe 6 = owe 10

For this equation, we're doing the same thing but replacing the positive number with a negative number.

               Step 1                                                            Step 2         
      - - - - - - - - - -  = -10                     For this step, you're practically combining
                                             whatever negative numbers you have with the negative sign.

Here is a video that may help you to use different equations through subtraction...


In case you need any practice for subtracting equations, please enjoy this game...



Hope you find subtracting easier know that you've read this.
GOOD LUCK!
January 8, 2014

1 comment:

  1. Thank you for sharing the techniques! All the exemplars really helped me, and you even showed the process. Not only that but a video and game to futher extend our learning! :) Good job!

    ReplyDelete

 

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