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Math Help - Need a Method(s) to work out percentages...

  1. #1
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    Need a Method(s) to work out percentages...

    Well my teacher said there were 3 ways for working them out, you wouldentmind going over me with them, help would be thanking =]

    I know one way which is using mulitplication:
    Example: 20% of 60
    20/100 of 200/1 (i canecel with common factor then times top two..)

    also theres this "find 1%" one and fidnign 10% method, explain that if possible

    the other one I THINK its a division method but ime not 100% sure.


    HELP IS VERY GREAT FULL THANKS!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by xAlanxEnglandx View Post
    Well my teacher said there were 3 ways for working them out, you wouldentmind going over me with them, help would be thanking =]

    I know one way which is using mulitplication:
    Example: 20% of 60
    20/100 of 200/1 (i canecel with common factor then times top two..)

    also theres this "find 1%" one and fidnign 10% method, explain that if possible

    the other one I THINK its a division method but ime not 100% sure.


    HELP IS VERY GREAT FULL THANKS!
    the first method you have is good.

    if someone asks what is 20% of 60, they are asking \frac {20}{100} \times 60 = ?

    it's a good way to lay it out, especially since you can pretty much transliterate the equation from the english sentence, so it is easy to remember.

    since "percent" means "out of 100" and "of" in math means "multiply", it's easy to see that "20 percent of 60" is the same as "20 over 100 times 60" so that's good
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  3. #3
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    answer

    A quicker way to solve 20% of 60 is to multiply 60 x .20 and you will come up with 12 and then you subtract 12 from 60 and your result will be 58 (you do the same thing with any other percent)
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  4. #4
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    Quote Originally Posted by cookiesncreme View Post
    A quicker way to solve 20% of 60 is to multiply 60 x .20 and you will come up with 12 and then you subtract 12 from 60 and your result will be 58 (you do the same thing with any other percent)
    Hi,

    if you subtract 12 from 60 then you'll get 48 and that's 80% of 60
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by cookiesncreme View Post
    A quicker way to solve 20% of 60 is to multiply 60 x .20 and you will come up with 12
    this is not a quicker method, this is EXACTLY what i suggested. note that 20/100 = 0.20. i used fractions to show where the decimal 0.2 came from, as i assume some students might have trouble with converting percentages to decimals

    and then you subtract 12 from 60 and your result will be 58 (you do the same thing with any other percent)
    earboth already addressed this
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