Nicole's Percent Post

this is my percent post????????????!!!!!

1.

• 50% - To find 50% of a number, divide by 2.

• 10% - To find 10% of a number, divide by 10.

• 1% - To find 1% of a number, divide by 100.

• 25% - To find 25% of a number, divide by 4, or divide 50% of the number by 2.

The definition of percent: Percent means out of 100 and is another way of saying hundredths. ex. 30% means 30/100 or 0.30.

2. I didn't understand this question because I thought you had to do 3 examples for each.... But either way, the circle graphs are pretty accurate since I used a graph program. (yay for me)

• 180%

• 12 3/4%

• 0.7%

3.

• 26%
  Decimal- To convert 26% into a decimal, you must divide the number by 100. This is because percent means out of 100.
  26÷100=0.26
  Fraction- To convert 26% into a fraction, you must first take it's equivalent as a decimal, (in this case, 0.26) and determine the place value of this decimal falls under. (Hundredths) therefore, this fraction will have the denominator of 100. The numerator is 26 for this case.
  0.26 is equivalent to 26/100
• 7/10
  Decimal- To convert 7/10 into a decimal, always remember that it basically means, in this case, 7 divided by 10.
  7÷10=0.7
  Percent- To convert 7/10 into a percent, you take the decimal, 0.7 and multiply by 100.
  0.7 x 100= 70%
• 0.024
  Percent- To convert 0.024 into a percent, you multiply it by 100.
  0.024 x 100= 2.4%
  Fraction- To convert 0.024 into a fraction, you determine the place value the number is in. This number is in the thousandths place, so the denominator will be 1000. The numerator is 24.
  0.024 is equivalent to 24/1000

4. 

• 20% of 60
  Mental-
  60÷10=6 (10%), 6 x 2 = 12 (20%)
  Calculator-
  60÷100=0.6 (1%), 0.6 x 20= 12 (20%)
• 0.1% of 40
  Mental-
  40÷100=0.4 (1%), 0.4÷10=0.04 (0.1%)
  Calculator-
  0.1÷100=0.001, 0.001 x 40= 0.04
• 250% of 400
  Mental-
  400 x 2= 800 (200%), 400÷2= 200 (50%). 800+200=1000 (250%)
  Calculator-
  250÷100=2.5, 2.5 x 400= 1000.

5.
Question #7 on page 149.
A herd of caribou was moved to a new location. The population increased by 10% the first year and the increased by 20% the second year.
a) Find the population after the second year.
First year-
100÷10=10 (10%)
100+10=110.
Second year-
110÷10=11 (10%)
11 x 2=22 (20%)

110+22=132

b) Explain why there was not a 30% increase in population over the two years.
The increase of caribou population is not 30% because the population on the second year (20%) was determined by the increase on the first year (10%).



~links/references~
I remember seeing this website when I was first learning about Decimals, Percents and Fractions. It's straight to the point and even though this may seem like a very "childish" website, it can help you when you're just having a brain-fart (in which I did while doing this assignment hahaha!)
http://www.mathsisfun.com/decimal-fraction-percentage.html

An interesting video. *gasp* He explains when trying to find the percent of a number, he replaces the "%" sign with a decimal, and moving it two places to the left, instead of just dividing by 100.
http://www.youtube.com/watch?v=Im0VnXfYSns&noredirect=1


badabing badaboom see you next time