Lotte's Percent Post

Percent

Percent means per hundred, and it is the equivalent fraction out of 100.

What is the reason of why they choose number 100?

The reason why they choose 100 because it is the best way and the easier way,  its not small and not big, its right. It can easily seen too.

What is Percent?

      Per/cent

out of /100

% means 0/0  and it means 100.

100% means: whole, everything, all

50% means: half, 20/40, 50/100

1%  means: 1 out of 2

You can use T-charts to find the Percent.

For example 15% out of 315

                       %                                    Score

      /20           100                                   315             /20

    *3               5                                     15.75            *3

                       15                                   47.25 or 47

Representing Percent

Percent

• Means out of 100
• Another name for "hundredths"

65 means 65 out of 100 or 65

                                            100 or 0.65.

  

180%

0.6%

12 3/8

Converting Percents Fraction to Decimals to Percent %     3         3/40= 0.075     =  7.5   or 7.5%    40                      1             100

Decimals to Percent to Fraction (simplify)

                0.268     0.268    = 26.8     or 26.8%     or   268
                                  1           100                               1000

•  Percents to Decimal to Fraction

              750%       750%        =     7.5     =    7.5         =     5
                               100                                 100                10

   
Percent of a number

1.) 20% of 60                            60                        20%
                                                   
20/100= 0.20                            60                        100   
                                           /5     12                         20             /5             
0.20* 60= 12                             

20% of 60 is 12


2.)  0.1% of  40                           40                      0.1
                                                    
0.1/ 100= 0.001                        40                        100
                                                   0.040                   0.1
                                                                   
0.001 * 40= 0.040 

3.) 250% of 400                       400                       250%      
         
100/250=2.50                           800                      200
                                                           
2.50 * 400=1000                      200                         50
                                               +1000                     250


Combining Percents

Discount- what you save
Sale Price- what you pay

example:

11% of 35
100+ 11= 111
111/100 =1.11
35 * 1.11= $ 38.85

Total cost $ 38.85

 A herd of 100 caribou was moved to a new location. the population increased by 10% the first year and then increased by 20% the second year.


1st
100+10=110
110/100=1.1
1.1*100=110
2nd 
20+100=120
120/100=1.2
1.2*110=132

http://www.youtube.com/watch?v=s11SiS0tVjI  
Decimal ,Percent, Fraction.
3                                   Decimal          Percent                   Fraction
26%                                0.26                    26%                26/100  ,   13/50
7/10                                0.7                      70%                7/10     ,    3 50/100
0.024                              0.00024                                     24 /100000   ,  12/50000 ,  6/25000

4              

20% of 60           100/1*60 = 60
                              20/100*60=12


0.1% of 40           100/1000=0.1
                              40/1000=0.040 

250% of 400       100*4=400
                              250*4=1000

 5
I choose number 3.
15%
My answer is no because:

100+15=115
15/115+10%
11.5(11 of 10=11.5)
126.5
31.625+25% of 126.5
158.125

200* 0.15=30
230*0.1=23
253
200*0.25=50
250

Benton's Percent Post

 A percent is an equivalent fraction out of 100.

 Here is how we find percents, in this example there are 40 apples.
 The 100% of the apples is 40/40
 We will be finding 50%, 25%, 10% and 1% using ratio tables.

          50%
          %   | Apples
÷2   100 | 40 /÷
     50  |   20

         25%
            %  |  Apples
÷ 4     100  |   40   /÷
    10   |    4

        10%

         %   |  Apples
÷10     100  |    40  ÷ 10
    25   |    10

     1%
         %    | Apples

÷100      100 | 40    ÷100

     1   | 0.4

Representing Percents
1) 180%

2) 12 3/4%

3) 0.7%

 

Converting Fraction-Decimal-Percent

1) 26%

26 ÷ 100 = 0.26

0.26 x 100 = 26/100

2) 7/10

7 ÷ 10 = 0.7

0.7 x 100 = 70%

3) 0.024

0.024 x 100 = 2.4%.

2.4/100

Percents

Calculator: 60 - 80% = 12                                                      Mental Math:  60 ÷ 5 = 12

                                                                                                                       100 ÷ 5 = 20

                                                                                     

               2) 0.1% of 40

 

Calculator: 40 ÷ 100 = 0.4                                                   Mental Math: 40 ÷ 1000 = 0.4

                                                                                                                  100 ÷ 1000 = 0.1

                3) 250% of 400

Calculator: 400 x 2.5 = 1000                                             Mental Math: 400 x 2 = 800 | 400 ÷ 2 = 200

                                                                                                                  800 + 200 = 1000
                                                                                                                  100 x 2 = 200 | 100 ÷ 2 = 50

                                                                                          200 + 50 = 250

Combining Percents

4.4 Pg. 149

7. A herd of 100 caribou was moved to a new location. The population increased by 10% the first year and then increased by 20% the second year.

a) Find the population after the second year.
b) Explain why there was not a 30% increase in population over the two years.

a)The population of the caribou herd after the second year was 132

The caribou herd's numbers increased by 10% the first year creating a total number of 110 caribou. The second year, the herd of caribou, now numbering 110 in total increased it's numbers by 20% for a total of 132 caribou at the end of the second year.

b) There was not a 30% increase in population over the two years because the 100% changed instead of remaining static. The 100% increased from 100 to 110 by the end of the first year and then there was a 20% increase of the current 100% raising the 100% to 132.

Discount is the money you save.

Sale Price is what you pay at the end.

4.4 Pg.148 Show You Know

 What is the final sale price at each store? Which is a better buy? Explain your thinking.

Store A: 50% off one day only
Store B: 25% off one day followed by 25% off the reduced price the second day

Example: you want to buy a $60 pair of boots.

Store A

Since 50% is equal to half, we can just half the number in question.

60 ÷ 2 = 30

The sale price is 30$

                                                  

Store B

First Day. As 25% is equal to a quarter, we can simply divide the number by 4.

60 ÷ 4 = 15                   60 - 15= 45

The sale price is now 45$

          Second Day.  We now divide the 100% (now 45$) in 4 again.

 45 ÷ 4 = 11.25                  45 - 11.25 = 33.75

The sale price is now 33.75$

Which is a better buy?

Store A is a much better choice because they're offering a $30 pair of boots compared to Store B's price of 33.75.