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

Lizley's Percent Post

Percent means
-percent means "out of a hundred"

*This is how to find the percent of a fraction:
 9   X 10  =  90
10  X 10  = 100
= 90%

But why 100?
-100 is used because its easy to use/its a friendly number.

*Meanings

100% - means all, everything, 100 , 100%
                                              100
                                    
50% - means half,  50  , 1 , 50%
                            100   2

25% - means half 50, 25 %, 25 , 100
                                            100    4

10% - means 100 ,  10 , 10%
                      10    100

1% - means 1 out of a 100,  1   , 100 , 1%
                                          100     1

But how about 205% ?
-it is improper/top heavy
-it means 2 holes
- 205
  100

Representing Percent

 180%

100

80

0.6%

                                               

12 3

     8

                                 

How to convert from Decimals to Percents to Fraction

1) 26%

-To convert it to become a decimal, you need to divide 26 to 100.

26 ÷ 100 = 0.26

to be simpler, just move the decimal point two spaces to the left.

26. → 0.26

-To convert it to fraction, you just make it 26/100 and simplify it to 13/50

2) 7/10

-To convert it to percent, you just need to divide the numerator to the denominator. Then move the decimal point two spaces to the right.

7 ÷ 10 = 0.7

0.7 → 7. = 7%

-To convert it to decimal is just dividing the numerator to the denominator.

7 ÷ 10 = 0.7

3) 0.024

-To convert decimal to percent, you just need to move the decimal point 2 spaces to the right.

0.024 → 2.4%

-To convert decimal to fraction, you need to convert it to decimal, and count the decimal places. The number before the decimal point will be the whole number.

2.4 → 2 4/10 = 2 2/5

How to get the percent of a number

      
 20% of 60 :

Mental
       %  | #                                                                                                      
÷5 100 | 60  ÷5                                  
       20 |12

Calculator
20 ÷ 100 = 0.20 = 0.2
0.2 x 60 = 12

20% of 60 is 12

                           
0.1% of 40:

Mental
               % | # 
÷10      100 | 40    ÷ 10
÷100      10 | 4      ÷ 100
             0.1 | 0.04

Calculator
 0.1÷100=0.001
0.001 x 40 = 0.04

0.1% of 40 is 0.04

250% of 100

Mental

                 %| #
             100 | 100

÷ 100       1  | 1         ÷100

x 250     250|250       x250

Calculator

100 ÷ 100 = 1

1 x 250 = 250

 

Combining Percents

Discount  - What you save

Sale Price - What you pay

 _____________________

Problem:

 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.

1. You have to find the 10% of 100 to know the population that increased the 1st year.

 

 

2. Then, add it to 100.

 

100 + 10 = 110

 

3. Find out the 20% of 110, and add it to 110, because 110 is our new total.

 

110 ÷ 100 = 1.1

1.1 x 20 = 22

110 + 22 = 132

 

 



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

If the percent had changed, the final answer would change too.