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Math Help - calculator that can transpose formulae

  1. #1
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    calculator that can transpose formulae

    Hello everybody..
    im a first year university student studying aeronautical and mechanical engineering. I was never taught maths at school as i was put in the lower group with all the trouble making kids. So as soon as i got to uni they expect me to know everything maths wise and i dont. Thats why im here

    my first question is:-

    is anybody aware of a hand held calculator (can be taken into exams) that has the ability to transpose formulae?

    thanks in advance
    alex
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  2. #2
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    Not me!
    I reckon you should just develop the skill of doing it.
    Why not throw down a few troublesome formulae and we can show you?
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  3. #3
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    Quote Originally Posted by pk090 View Post
    Hello everybody..
    im a first year university student studying aeronautical and mechanical engineering. I was never taught maths at school as i was put in the lower group with all the trouble making kids. So as soon as i got to uni they expect me to know everything maths wise and i dont. Thats why im here

    my first question is:-

    is anybody aware of a hand held calculator (can be taken into exams) that has the ability to transpose formulae?

    thanks in advance
    alex
    How totally unreasonable and unexpected that an aeronautical and mechanical engineering degree what expect you to be mathematically competent. You sure got blindsided.

    Any CAS calculator will do what you ask. Now pray that you can use it in exams.
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    Quote Originally Posted by mr fantastic View Post
    How totally unreasonable and unexpected that an aeronautical and mechanical engineering degree what expect you to be mathematically competent. You sure got blindsided.

    Any CAS calculator will do what you ask. Now pray that you can use it in exams.
    Well believe it or not im a practical man nor a writing man. I really struggle with exams but exceed at the practical sides...

    now can i get ridiculed for asking what a CAS calculator is?
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  5. #5
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    Quote Originally Posted by pk090 View Post
    Well believe it or not im a practical man nor a writing man. I really struggle with exams but exceed at the practical sides...

    now can i get ridiculed for asking what a CAS calculator is?
    I only ridicule once per thread so I'm afraid I can't comply. However, my good friend Google might be of service: CAS calculator - Google Search=
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    ok so from what i can see its a graphical calculator. to me this means it draws pretty pictures on my command. how can it help me transpose formulae?
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    Quote Originally Posted by pk090 View Post
    Hello everybody..
    im a first year university student studying aeronautical and mechanical engineering. I was never taught maths at school as i was put in the lower group with all the trouble making kids. So as soon as i got to uni they expect me to know everything maths wise and i dont. Thats why im here

    my first question is:-

    is anybody aware of a hand held calculator (can be taken into exams) that has the ability to transpose formulae?

    thanks in advance
    alex
    What institution is this?

    CB
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  8. #8
    Grand Panjandrum
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    Quote Originally Posted by pk090 View Post
    Well believe it or not im a practical man nor a writing man. I really struggle with exams but exceed at the practical sides...

    now can i get ridiculed for asking what a CAS calculator is?


    I'm afraid the ridicule is for a system that will admit you to a degree course that you have minimal chance of completing satisfactorily.

    I suppose there is the possibility that the course has been watered down so that a minimum of maths is required in which case you will be able to complete the course (but you might find that engineering employers will be reluctant to recruit from your course).

    May be I'm just out of touch. I attended my employers schools roadshow a couple of years ago and have refused since. The impression they gave to the kids is that we only employ what I would describe as fitters. (the reality was that at that time we only recruited graduates as trainee project managers, which was equally ludicrous but at the other extreme)

    CB
    Last edited by CaptainBlack; January 26th 2010 at 04:56 AM.
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  9. #9
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    Given you have a good sense of humour Alex,
    I consider mr fantastic and CaptainBlack to have appealed very genuinely to your practical side.
    You can become very good at maths if you really go for it,
    if you put in the work.
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    well yes i do have a sense of humour and i think its key to have one.
    I am studying at glyndwr university, wrexham formally know as NEWI.
    I had a maths exam yesterday which didnt go to plan and i have a mechanics exam tomorrow which i have been studying for night and day. (this exam will be on calculating stresses and strains on materials at given points, working out other variables mainly from equations and formulae.) I have never been taught how to transpose formulae apart from the old triangle method for simple 3 variable ones such as :-

    V=D
    T
    where you cover the one you want with ur finger leaving you with what you want...hard to explain but how i was told to do it...

    tomorrows exam has transposition of formula on so was looking for a calculator to do it for me and help me out. If not any advice on manipulating the equations?
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  11. #11
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    bah the t is supposed to be under the D....text fail.
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  12. #12
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    In a case such as

    V=\frac{D}{T}

    all you need to be aware of is the 3 ways we can represent something like 2(3)=6

    2(3)=6,\ \frac{2(3)}{3}=\frac{6}{3},\ 2=\frac{6}{3}

    2(3)=6,\ \frac{2(3)}{2}=\frac{6}{2},\ 3=\frac{6}{2}

    Same procedure with 5(4)=20

    5(4)=20,\ 4=\frac{20}{5},\ 5=\frac{20}{4}

    From the pattern ab=c,\ a=\frac{c}{b},\ b=\frac{c}{a}

    or ab=c,\ \frac{ab}{b}=\frac{c}{b},\ a=\frac{c}{b},\ etc

    Hence

    V=\frac{D}{T}

    VT=\frac{DT}{T}=D

    \frac{VT}{V}=T=\frac{D}{V}

    All you need do is learn to "juggle".
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  13. #13
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    Quote Originally Posted by pk090 View Post
    well yes i do have a sense of humour and i think its key to have one.
    I am studying at glyndwr university, wrexham formally know as NEWI.
    I had a maths exam yesterday which didnt go to plan and i have a mechanics exam tomorrow which i have been studying for night and day. (this exam will be on calculating stresses and strains on materials at given points, working out other variables mainly from equations and formulae.) I have never been taught how to transpose formulae apart from the old triangle method for simple 3 variable ones such as :-

    V=D
    T
    where you cover the one you want with ur finger leaving you with what you want...hard to explain but how i was told to do it...

    tomorrows exam has transposition of formula on so was looking for a calculator to do it for me and help me out. If not any advice on manipulating the equations?
    You will need to check what calculators are permmited. A CAS calculator which is what MrF suggested you Google for, will do what you want (at least within reason) but they may not be allowed in exams (TI-inspire is typical)

    CB
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  14. #14
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    Quote Originally Posted by pk090 View Post
    ok so from what i can see its a graphical calculator. to me this means it draws pretty pictures on my command. how can it help me transpose formulae?
    You appear to have studied the content of the websites listed by Google as diligently as you studied your mathematics at school.
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  15. #15
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    Quote Originally Posted by CaptainBlack View Post
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    I'm afraid the ridicule is for a system that will admit you to a degree course that you have minimal chance of completing satisfactorily.

    I suppose there is the possibility that the course has been watered down so that a minimum of maths is required in which case you will be able to complete the course (but you might find that engineering employers will be reluctant to recruit from your course).

    May be I'm just out of touch. I attended my employers schools roadshow a couple of years ago and have refused since. The impression they gave to the kids is that we only employ what I would describe as fitters. (the reality was that at that time we only recruited graduates as trainee project managers, which was equally ludicrous but at the other extreme)

    CB

    Having written the above I suppose I might be wrong in assuming mathematical competence on the part of professional engineers:

    People here may recall that I recently was part of the teaching team on a short course on Torpedo Technology. All of the students were practicing engineers with many years experience.

    The greatest problem that the instructional staff had was getting the students to do simple mathematical exercises using logs. With some notable exceptions they were lost as soon as any maths no matter how elementary appeared.

    I was at the back when not teaching so did not get an opportunity to see their faces when a colleague was presenting the DSP part of the course. It must have been a picture

    CB
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