Sig Figs?

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Jasmine Chow 1F
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 1 time

Sig Figs?

Postby Jasmine Chow 1F » Wed Oct 03, 2018 10:55 pm

How do sig figs work?

Phoebe Chen 4I
Posts: 55
Joined: Fri Sep 28, 2018 12:29 am

Re: Sig Figs?

Postby Phoebe Chen 4I » Wed Oct 03, 2018 11:03 pm

Significant Figures are used to tell us how precise our measurement is. The more digits you have the more precise your measurement will tend to be. All number that are not zero are sig figs. Zeros following a number are sig figs. If there are only zeros before non-zero numbers, those are not sig figs.
4.567 = 4 sig figs
4.567000 = 6 sig figs
0.00004 = 1 sig fig
0.00400 = 3 sig figs

Beatrice Petelo 1F
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Re: Sig Figs?

Postby Beatrice Petelo 1F » Wed Oct 03, 2018 11:09 pm

Hello,

One important rule about significant figures is that the zeroes on the left do not count as sig figs. Terminal zeroes on the right count.
For example:
8.23, 0.845, 9.00, 5.60, and 0.000123 all have three significant figures.

When multiplying and dividing w/ sig figs, the answers will be in the least number of significant figures.
E.g.,
10.00/2.0 = 5.0
10.00 has four sig figs, while 2.0 has two sig figs. Therefore, the answer will have two sig figs.

Also, when adding and subtracting w/ sig figs, the answers will have the least number of decimal places.
E.g.,
6.12+3.7=9.8
6.12 has three sig figs and 3.7 has two sig figs. The answer will have two sig figs.

Sana_Mian_3G
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

Re: Sig Figs?

Postby Sana_Mian_3G » Thu Oct 04, 2018 9:42 pm

Also, there is another rule for sig figs with decimal points. Zero's count with decimal, but zero's don't count without decimals.
Example: 420 is two sig figs, but 420. is three sig figs


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