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Tuesday, November 26, 2013

Andrea's Percent post

Andrea's Percent Post

What is percent?
Percent means..
  • Is an equivalent fraction out of a 100.
For example, 45% (read as "forty-five percent") is equal to 45/100, or 0.45. 

1.)If you have a question like:
What is 25% of 80?
you can solve that by using T- chart.
          
100/80
25 / 20
to solve this you will have to divide 100 by 4 to get 25%, you have to divide by 4 in the other side so it's equal, so you divide 80 by 4 which give you 20.


Representing percent
2.)

1.) 180 %


2.) 0.6%

3.) 12 3/8 %


Converting percent 
3.)
% --> D --> F

750% = 7.5 = 7 1/2
100 

12 3/4% = 12.75 or 0.1275 = 1275
100         1              10,000



Percent of a number
4.)

1. 20% of 60
Calculator:              Mental math:
60/100 = 0.6 x 20 = 12   #     % 
                         60 |100
                                                                     /10                                 /10
                                                                                          6    | 10
                                                                             / 6                                     /6
                                                           12   | 20 
2. 0.1% of 40
Calculator:                 Mental math:
40/100 = 0.4 x 0.1 = 0.004  #      %
                            40 |100
                        /100             /100
                            0.4 | 1 
                        /10 0.04 |0.1 /10
3. 250% of 400
Calculator:                Mental math:
400/100 = 4 x 250 = 1,000  #      %
                           400|100
                        x 2              x 2 
                                    800|200
                           /4              / 4
                          200 | 50
                         __________
                         1000 | 250
5.    
Combining percent

 PS4- $385   Discount- 15%
To find the sale price you have to subtract 15 by a 100.
100-15 = 85
So now the sale price is 85.
Then divide the discount by 100.
Which gives you 0.15.
Now you multiply by how much the PS4 cost,and it will give you an answer of 57,75.
(0.15 x 385 = 57.75)

Then you subtract 385 by 57.77, which gives you 327.23.
(385-57.77= 327.23)
You will pay $ 327.23.
                      
    

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