# Significant digit

88.375/1264.7=

234.6+89x6.8=

471-22.85=

Calculate all questions to the correct significant digit

 Credendovidis Posts: 1,593, Reputation: 481 - #2 Nov 9, 2008, 05:40 PM

Have you done the 3 calculations already?
If so : what have did you get so far?
You do not seriously expect us to do your homework, don't you?

moe6142 (Nov 11, 2008 03:39 PM): you ar enot telling me the answer   Source:
 Credendovidis Posts: 1,593, Reputation: 481 - #3 Nov 11, 2008, 04:36 PM
Quote:
 Originally Posted by moe6142 you ar enot telling me the answer
Of course I don't. It is not my homework, it is your homework.
I just provided you with some guidelines on how to get to the proper answer.

I suggested :

Have you done the 3 calculations already? - You did not answer : I doubt you did any calculations.
If so : what have did you get so far? - Lacking answers and calculations how to know what you missed ?
You do not seriously expect us to do your homework, don't you? - Apparently you did ...

 lovebug2140 Posts: 49, Reputation: -2 Junior Member #4 Nov 11, 2008, 11:04 PM
Comment on Credendovidis's post
Quote:
 Originally Posted by Credendovidis First study your lesbooks or follow this link Have you done the 3 calculations already? If so : what have did you get so far? You do not seriously expect us to do your homework, don't you? :)
just balancing for you :)
 moe6142 Posts: 11, Reputation: 1 New Member #5 Nov 12, 2008, 05:55 AM
Quote:
 Originally Posted by Credendovidis Of course I don't. It is not my homework, it is your homework. I just provided you with some guidelines on how to get to the proper answer. I suggested : First study your lesbooks (or follow this link) - I guess you did neither. Have you done the 3 calculations already? - You did not answer : I doubt you did any calculations. If so : what have did you get so far? - Lacking answers and calculations how to know what you missed ? You do not seriously expect us to do your homework, don't you? - Apparently you did ...

88.375/1264.7=0.069878

234.6+89x6.8=840

471-22.85=448
 ebaines Posts: 10,055, Reputation: 5539 Expert #6 Nov 12, 2008, 07:30 AM
I think you are including too many digits in some of your answers . For example:

234.6 + 89*6.8 has only 2 significant digits. But your answer (840) has 3. I would rewrite using scientific notation, like this:

8.4 x 10^2

This way it's clear that there are only 2 significant digits ( 8 and 4)
 Credendovidis Posts: 1,593, Reputation: 481 - #7 Nov 12, 2008, 05:01 PM
Moe6142

calculate all questions to the correct significant digit

A = 88.375/1264.7=0.069878 --> = 6.98788...

B = 234.6+89x6.8=840 --------> = 839.8 (not 840)

C = 471-22.85=448 -----------> = 448.15

I have to assume that in your lesbook the meaning of "correct significant digit" has been explained.
So now the question : what does that "correct significant digit" mean here?
And what is that than in each of these three replies ?

(I can not sit next to you during your next exam, so that is why YOU have to do your homework yourself ...)

.

.
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #8 Nov 13, 2008, 12:49 AM
Hmmm... I may be wrong, but I think that the number of significant figures you need to give is already given in the question itself.

88.375/1264.7= (all are 5 sig fig; answer in 5 sig fig)

234.6+89x6.8= (highest sig fig = 4; answer in 4 sig fig)

471-22.85= (highest sig fig = 4; answer in 4 sig fig)
 Capuchin Posts: 5,319, Reputation: 3601 Uber Member #9 Nov 13, 2008, 12:53 AM
In a physics setting, you want to use the lowest sig fig, as this is the lowest accuracy of all yoru measurements.

But the question is silly, as these seem to be pure maths questions where there's no justification for quoting to a certain sig fig.
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #10 Nov 13, 2008, 01:14 AM
I'm not so following well here... You said:

"In a physics setting, you want to use the lowest sig fig"

Lowest? I thought that physics was a subject of accuracy? Of course that one should not try to get into too much accuracy, for fear that the result is wrong... But still!

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