Axl's Percent Post

PERCENT MEANS-  is an equivalent fraction out of 100, per(out of) cent(100)

Here how we find the percent:
Example:

There are 40 apples, the 100% of apples in 40/40
10%
50%
25%
1%

10 % means- 10 out of 100- divide 100 percent to 10 which gives you 10 and divide the 40 apples to 10 which gives you the answer of 4. (4 out of 40 or 10 out of 100)


50% means- half, part/whole, 20 out of 40 or 50 out of 100 - dived the 100 percent to 2 which gives you 50 and you also need to divide 40 apples  to 2 which gives you 20. (20 out of 40 or 50 out of 100)

25% means- quarter out of 100- divide 100 percent to 4 gives you 25 and divide 40 apples to 4 gives you 10. (10 out of 40 or 25 out of 100)

1% means- 1 out of 100- divide 100 percent to 1 gives you the answer of 1 and divide 40 apples gives you the answer of 0.4. (0.4 out of 40 or 1 out of 100)

REPRESENTING PERCENTS:

A.180%                                          

B. 0.6%

C. 12 3/8

CONVERTING PERCENTS:

Fraction to Decimal and Percent:

171/300: 171/300= 0.57/1 x 100= 57/100= 57%

Decimal to Percent and Fraction:

5.98: 5.98/1 x 100= 598/100= 598%= 598/100

Percent to Decimal and Fraction:

750%: 750%/100= 7.5/1= 7 and 5/10= 7 and 1/2

PERCENT OF A NUMBER:

20% of 60
20/100=0.2
0.2 x 60=12
Calculation:
20  x 60=1200
1200/100=12

250% of 400
25/100=2.5
2.5 x 100=1000
Calculation:
250 x 400=1000000
1000000/100=1000


0.1% of 40
0.1/100=0.001
0.001 x 40=0.004
Calculation:
o.1 x 40=4
4/100=0.004

COMBINING PERCENTS:

Question 7 page 149:

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

First year:
caribou= 10%
10% + 100= 110
110/10= 1.1
1.1 x 100=  110

Second year:
caribou= 20%
20% + 100= 120
120/100= 1.2
1.2 x 100= 132

explain why there are not 30 % increase in population over  the two years?

30% was not used because 100% had change. in the first year the total of caribou was 10%, but in the second year it increased 20%, so we need to make another solution. but the total wasn't 100 anymore it change to 110.


SHOW YOU KNOW

Store A: Price 100

100 + 25%= 125
25/100= 0.25
0.25 x 125= 31.25

Store B; Price 100

100 + 50%= 150
50/100= 0.5
0.5 x 150= 75

Store A is best to buy than Store B

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.