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Thread: Arithmetic challenge involving percents

  1. #1
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    Arithmetic challenge involving percents

    .


    Can you work all of these out in your head and/or on paper in less than a total of two minutes?


    65% of 10

    18% of $\displaystyle \ 16\tfrac23$

    35% of 20

    8% of 25

    12% of $\displaystyle \ 33\tfrac13$

    38% of 50

    9% of $\displaystyle \ 66\tfrac23$

    44% of 75
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  2. #2
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    Re: Arithmetic challenge involving percents

    Quote Originally Posted by greg1313 View Post
    .


    Can you work all of these out in your head and/or on paper in less than a total of two minutes?
    No.

    I am answering the real question here.
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  3. #3
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    Re: Arithmetic challenge involving percents

    Yes. Some mental shortcuts help; for example 18% of 16$\frac 2 3$ is the same as 16$\frac 2 3 $% of 18, which is 1/6 of 18.
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