#1
Even if you'e not named Robert.

So, im sitting there, just finished my maths homework...i open my Physics stuff..and relaise that i've forgotten how to do significant figures.

help!

the first question is - round 11.85467 to 3 significant figures.

Once i get tht, i'll know what im doing, but a little explanation would be great:P
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#2
google..
^^ i only said that because i forgot myself
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#4
^^isnt that rounding?

i'd have thought it'd be 11.8? jst guessing.
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#6
11.9
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#7
i cant help t, i think the last time i used it was about 3 years ago.
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#8
Quote by beatlemaniac-93
^^isnt that rounding?

i'd have thought it'd be 11.8? jst guessing.

It's 11.9
You have to round to get the right number of sig figs.
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#9
Quote by beatlemaniac-93
^^isnt that rounding?

i'd have thought it'd be 11.8? jst guessing.


Yes it is rounding... to 3 significant figures. You said it yourself - 'round 11.85467 to 3 significant figures'.
#10
Quote by 12Jim34
11.9. Significant figures means every number.


Unless they are zeros at the start. 0.000345 to 3 s.f. isn't 0.00. You strat from the first not zero number, but after that zeros count...
#11
11.85467

-> 11.8547

-> -> 11.855

-> -> -> 11.86

-> -> -> -> 11.9
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#13
i see...cheers guys

EDIT: so is 50.7835 = 50, or 50.7?
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#14
Neither, it's 50.8
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#15
Quote by beatlemaniac-93
i see...cheers guys

EDIT: so is 50.7835 = 50, or 50.7?

50.8 to 3 SF
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#17
Quote by beatlemaniac-93
i see...cheers guys

EDIT: so is 50.7835 = 50, or 50.7?


no 50.8
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#18
Quote by beatlemaniac-93
i see...cheers guys

EDIT: so is 50.7835 = 50, or 50.7?

we are not doing your homework...50.8
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#22
Quote by Vauxite
11.85467

-> 11.8547

-> -> 11.855

-> -> -> 11.86

-> -> -> -> 11.9


Is that you showing the steps of how you round off? Because if it is, then it's unbelievably wrong

(The answer is right though)
Last edited by AllTimeNewbie at Sep 22, 2008,
#23
Quote by AllTimeNewbie
Is that you showing the steps of how you round off? Because if it is, then it's unbelievably wrong

(The answer is right though)


Well that's how I was taught in school.
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#25
Christing hell that was freaky

I'm called Robert if you couldn't guess
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#26
Quote by Vauxite
11.85467

-> 11.8547

-> -> 11.855

-> -> -> 11.86

-> -> -> -> 11.9


That's terribly wrong and whilst the answer is right you can't round up every number or it will cause problems later.
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#27
Quote by Rankles
That's terribly wrong and whilst the answer is right you can't round up every number or it will cause problems later.


I always thought you round up every digit from the back onwards to make sure the final number rounds correctly.
Eh, it's not in my exams this year,
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#28
Quote by Vauxite
I always thought you round up every digit from the back onwards to make sure the final number rounds correctly.
Eh, it's not in my exams this year,

No, 'cause if you do it that way, 13.145 would become 13.2, even though it's actually closer to 13.1
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#29
Quote by beatlemaniac-93
i see...cheers guys

EDIT: so is 50.7835 = 50, or 50.7?


5-9 you round up, 1-4 you round down.
So 50.455 to 3 sig figs would be 50.5 and 50.449 to 3 sig figs would be 50.4.

Haven't done maths in 6 years but I'm pretty sure that's right.
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#30
Quote by SuperBlob
No, 'cause if you do it that way, 13.145 would become 13.2, even though it's actually closer to 13.1


Ah, so it is, thankyou oh masterful one.
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#31
Rounding to significant figures:

Just count the numbers along, so if it's 51.2365 to 3 S.F, it's 51.2.

However, if the number is 0.0032154, the answer isn't 0.

You can ignore the zeroes before the digits that "count", so that would be 0.00322.
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#32
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#33
Me?

I'm 22
Quote by GLP_Arclite
Pooping is well good though, to be fair.


I've got a handle on the fiction.

I'm losing my grip, 'cos I'm losing my fingers.
#34
No, TS.
I think its time to pack your things lets go,
To a place where we both know,
And dont worry, I'll drive real slow,
Spend some time before we go..
#35
Quote by Vauxite
11.85467

-> 11.8547

-> -> 11.855

-> -> -> 11.86

-> -> -> -> 11.9

This is the best explanation.
#36
Quote by fretsonfire74
This is the best explanation.


Not really, He arrives at the right answer, but his method is incorrect.
Quote by GLP_Arclite
Pooping is well good though, to be fair.


I've got a handle on the fiction.

I'm losing my grip, 'cos I'm losing my fingers.
#37
My names Robert you SOB
The sex offenders register.. personally, i don't even think they should be in school.
#38
ah well....

Im 15, and we did dig Fig last year, but i forgot it :P
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#39
Quote by 12Jim34
11.9. Significant figures means every number.


Done and done. Close thread.
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#40
Quote by beatlemaniac-93
oops, its to two...sorry :S


so then its 51.
a significant digit is any number from 1-9
51 contains two significant digits.

50.9, however, contains three because the zero is also significant.