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Thread: Question on Standard form

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    International Coach PhoenixFire's Avatar
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    Question on Standard form

    In some Maths homework, I came across a slight problem when using Standard form.

    The answer to a question was 29.7867*10^(-1)
    Becuase I know you can't have a correct Standard Form number starting with a number that is <10, so I remembered that you move the decimal place one place to the left, so that the number ended up being 2.978768*10^(???)
    The problem is, is that I don't know what to put the index number (or power) as, because it is near to 0.

    Anyone who can help?
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    Cricket Web Staff Member / Global Moderator Neil Pickup's Avatar
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    A number x10^(-1) is a number multiplied by 0.1 - seeing as 10^(-1) = 1/(10^1) = 1/10 = 0.1
    So your number is 29.7 x 0.1 = 2.97

    You're right, a standard form answer must start with a number between 1 and 9.999 - so you need to adjust the second part of the SF number to reflect that. 2.97 x 10^(?) = 2.97

    Clearly the answer to [10^(?)] needs to be 1 in order for the calculation to balance - and anything to the power of zero is 1.

    29.7x10^(-1) = 2.97x10^0
    ---

    Another way of looking at it is that you have divided the left-hand part of the calculation by ten, so you must multiply the right-hand part by the same amount to keep its value constant.
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    Cheers Neil, all's good.

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    Eyes not spreadsheets marc71178's Avatar
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    IIRC 10^(-1) is the same as 1/10.

    So the answer would be 2.97867
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    So no need for Standard Form in the answer then?

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    Cricket Web Staff Member / Global Moderator Neil Pickup's Avatar
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    Depends if the question asks specifically for an answer in standard form or not!

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    PY
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    To doubly complicate things, you have engineering standard form which asks for the exponential to be of the order of three i.e. milli, micro, kilo, mega, giga etc.

    I'd leave it without the standard form unless it explicitly asks for it.
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    Fairly quality idea, never thought of asking fellow CWers to do my homework for me.
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    Gah, I hated those prefixes. We had to work out how many Mega-Seconds equated to 1.98 Giga-Hours, nastily difficult.

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    Quote Originally Posted by Tom Halsey View Post
    Fairly quality idea, never thought of asking fellow CWers to do my homework for me.
    I usually ask Neil or Turd tbh.

    Turns out that Turd is a bit of a wizz at Algebra.

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    Is anyone a whiz at writing film reviews or Spanish coursework?Anyone?Please?

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    International Coach PhoenixFire's Avatar
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    Quote Originally Posted by open365 View Post
    Is anyone a whiz at writing film reviews or Spanish coursework?Anyone?Please?

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    Quote Originally Posted by open365 View Post
    Is anyone a whiz at writing film reviews or Spanish coursework?Anyone?Please?
    If I had time I would like to try my hand at reviewing films, when is it due?
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    International Vice-Captain open365's Avatar
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    Quote Originally Posted by Tomm NCCC View Post
    If I had time I would like to try my hand at reviewing films, when is it due?
    Last Monday.

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    Cricket Web: All-Time Legend Matteh's Avatar
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    Quote Originally Posted by open365 View Post
    Is anyone a whiz at writing film reviews or Spanish coursework?Anyone?Please?
    If it was German coursework then i could help, or Pitt could help if it was French. You've picked a dire language i'm afraid.
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