Lizley's Pay It Forward

We start volunteering at Winnipeg Harvest on our 2nd week here in Winnipeg. My parents joined first, then they invited us to volunteer for the next Saturday, so we start to volunteer every other Saturdays. We volunteer sorting breads, creating boxes, cleaning and sorting goods. We work from 9:00 am to 12:00 pm.

  

 

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.