Problem is:

If done on the calculator the result is

I must be doing something incorrectly...

-Add

-Add

So I get

Anyone know what I did incorrectly?

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- September 5th 2010, 11:07 AMpychonScientific notation
Problem is:

If done on the calculator the result is

I must be doing something incorrectly...

-Add

-Add

So I get

Anyone know what I did incorrectly? - September 5th 2010, 11:24 AMundefined
A proper way to do it would be

If working in significance arithmetic this would need to be rounded accordingly. - September 5th 2010, 12:34 PMpychon
brilliant... :)

another i'm stumbling on...

doing the math:

or

or

answer comes out to be , sn with my math

calculator calculates: - September 5th 2010, 12:44 PMundefined
- September 5th 2010, 12:51 PMpychon
erm, is there a manual for properly coding the math questions? i have no clue... anyway its the second you've listed, but in parentheses

- September 5th 2010, 01:04 PMundefined
What do you mean, "but in parentheses"? Adding parentheses to the expression you indicated has no effect because multiplication is associative.

For help with mathematical typesetting, see LaTeX Help Subforum.

You need to realize that means nothing more than 1.23 multiplied by 10^4. Compute as you would any other expression involving multiplication and division. Remember rules for exponents, and . - September 5th 2010, 01:24 PMpychon
Yep, I located LaTex in the faq and finally now in the forum.. mods need to fix the link.

Anyway, the math is being multipled as noted... the work is all there, but suspect your suggesting not to solve the value of the power until the final result.

Also, in parentheses the denomenator is , with what you had wouldn't that be incorrect? If there was a problem of , wouldn't that be not ?

- September 5th 2010, 01:43 PMundefined
- September 5th 2010, 02:13 PMpychon
I see where you're going, but must be doing something wrong. If the problem is entered entirely into my calculator is comes out to and I'm not getting anything close to that.

Maybe you could check a previous problem I had, is the answer correct?

answer

- September 5th 2010, 02:16 PMundefined
- September 5th 2010, 02:24 PMpychon
I don't know how I could be entering it into the calculator incorrectly when entering the entire problem into it... as noted before the answer I received was 43469706.81 and doing my math above and following order of operations (para, powers, mult/div)

- September 5th 2010, 02:42 PMundefined
The correct answer is indeed 43469706.81 (rounded). I see you had this all along, but using the method outlined above is more efficient (at least for most of these types of problems that you would need to work out on paper). You must be typing something wrong into your calculator because is not correct.

- September 5th 2010, 02:53 PMpychon
That's what confused me... not sure how displayed, but I calculated it several times and got that and been trying to figure out how it came out to , the math I did came out to ... writing out the long way too... but I like your suggestion... the more efficient the better. Though should be correct?

- September 5th 2010, 03:02 PMundefined
Rounded to four significant figures, yes is correct.

Maybe I'm preaching to the choir but for example if you were presented with this problem

you would definitely not want to expand numerator and denominator separately, but rather use the method given above and immediately see that the answer is .

As to your calculator woes, it's kind of hard to "diagnose over the phone" (meaning it would be much easier if I could see in person), but I suppose if you described what kind of calculator you have and what keystrokes you used we might get to the bottom of it. - September 5th 2010, 03:02 PMyeKciM
correct answer is

to get it by calculator :

enter 5.16 then pres "exp" than 6 than "-" (+/- probably is written) than multiply "*" then enter 8.3 than "exp" than 5 pres "=" , than divede ( / ) than 2.07 again "exp" and 4.... press "=" again (you can do it without "=" before dividing but if you need to write down on paper .... ) than you will get 0.000208101 so now press "FIX" or something like that (depending on type of calculator , can be F -> E .... or something ) than you will get :D:D:D