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Math Help - I need help for midterm FAST with %

  1. #1
    olemissreb123
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    I need help for midterm FAST with %

    I need help with %'s and conversions
    convert 0.23 to a %
    convert 1538 to a %
    convert 1/5% to a decimal ( i think it is .0020)
    Solve the portion 12% of 600
    Solve the rate (round to nearest tenth % 66 is _____% of 900
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by olemissreb123 View Post
    I need help with %'s and conversions
    convert 0.23 to a %
    convert 1538 to a %
    convert 1/5% to a decimal ( i think it is .0020)
    Solve the portion 12% of 600
    Solve the rate (round to nearest tenth % 66 is _____% of 900
    Recall that percentage is just a fancy word for "out of a hundred", so it is really expressing a number as a fraction where the denomenator (the bottom number) is 100. Then we replace the /100 with %. To change a decimal to percentage, you just multiply by 100, which amounts to moving the decimal point two places to the right. To change a percentage to a decimal, you do the opposite, divide by 100, which is moving the decimal point 2 places to the left.

    convert 0.23 to a %
    0.23 = (0.23*100)% = 23% ......................Note, we could have expresses 0.23 as 23/100, and so the percent would just be the top number, namely 23, so we get 23%

    convert 1538 to a %
    1538, this is a weird example, but 1538 = 153800/100 = 153800 %

    convert 1/5% to a decimal ( i think it is .0020)
    (1/5)% = (1/5)/100 = 1/500 = 0.002, you were right!


    Solve the portion 12% of 600
    12% of 600
    Rememer, 12% is just 12/100 and in math, "of" means "multiply"
    so 12% of 600 is:

    (12/100) * 600 = 12*6 = 72 .................note, * means multiply


    Solve the rate (round to nearest tenth % 66 is _____% of 900

    Remember! "of" means "multiply", % means "/100"

    Let the unknown percentage be x
    => 66 = x% * 900
    => 66 = x/100 * 900
    => 66/900 = x/100
    => 100(66/900) = x
    => x = 7.333333333333333% = 7.3 % to the nearest tenth
    Last edited by Jhevon; March 3rd 2007 at 08:22 AM.
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