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Wednesday, December 18, 2013

Josh's Percent Post (Josh J.)

Q:What is a percent?
A:A percent is an equivalent fraction out of 100. Since this is like a fraction itself, it can relate to fractions and can be used to change normal fractions into a percentage. To do so, you must divide the numerator of the fraction by the denominator of the fraction. After this you will get a decimal number out of 1. This means that there will be no decimal to get even past it if it was a normal fraction that you were working with. You must multiply the decimal by 100 and boom! You got yourself a nice percentage out of 100!

N/D=Decimal/1
Decimal/1 x 100=%/100

Q:What is 100%
A:Percent or to be more exact 100%, is everything or perfect. For example, if you were to get a test mark and you got 25/25, that would be perfect or "everything correct".

Q: How do you find 100%
A:Now when you guys do your tests, I'm sure you guys all love to find out the actual percent you guys got instead of having a lousy fraction. In order to change this fraction into a percent, we have to first find 100% of the fraction your working with. EX:

I got 25/25 on my test. I really want to know the percentage I actually got.
100% of 25 is.....

Then we need to know how much by percent, we actually have, or the numerator of the fraction in percent form. To do this, we must divide 100% by 1 which is the usual number when you want to get the percentage on a perfect test. Also, if you divide the percent, you must also divide the denominator of the fraction (25) by the amount you divided 100% by

100/1=100%
25/1=25

With this information, you can have an accurate answer that 100% of 25 is 25.

Q: How do you find 50%
A: To find 50 percent you use the same method. You just change the number you are dividing with by 2. EX:

I got 5/10 on my math test. I wonder what percent I actually got.
50% of 10 is......
100/2=50%
10/2=5

Q:How do you find 25%
A: To get 25% you must now divide by 4 when it comes to the part where we divide in this method. EX:

 My family gave 6/24's to the fundraiser at Saskatchewan. I wonder how much in percent that we actually helped them with.
25% of 24 is....
100/4=25%
24/4=6

Once again, you can confirm that 25/100 is the same as 6/24 because they are EQUIVALENT.

Q:How do you find 1%
A:To find 1 percent you must divide by 100 this time. EX:

My mom brought me to Superstore and I saw a jug of milk that said it was 0.4/40 in actual milk. I wonder how much milk in percent was really in that jug.
1% of 40 is....
100/100=1%
40/100=0.4

Finally, this concludes that there is 1% of actual milk in the jug because these fractions are EQUIVALENT! Speaking of equivalent, to find  out if 2 fractions are equivalent, you must use the cross multiplying or cross product method. in order to do this you must show that both are equal to each other with an equals sign.

50/100=1/2

Then you must multiply the numerator from the first fraction with the denominator of the other fraction. Do this with both fractions.

50x2=100
1x100=100

If you get both of the same products, you have EQUIVALENT fractions!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Representing Percent:

180%
 
0.6

 12 3/8%

Converting percents, fractions, and decimals
1. 3/40 :
3/4=0.075

0.075 x 100=7.5%

2. 0.268 :
0.268/1
0.268x100=26.8
1x100=100
26.8%

268/1000
268/2=134
1000/2=500
134/500
134/2=67
500/2=250
67/250

3. 750% :
750/100=7.5
7.5=7 1/2
7 1/2

Converting Decimals, to percents, to fractions



Finding percents w/ mental math and a calculator

0.2x60=12
0.001x40=0.04
2.5x400=1000

Combining percents

0.15x200=30
200+30=230
230x0.10=23
230+23=253


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