Sig Figs

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Jennifer Torres 2L
Posts: 62
Joined: Tue Nov 14, 2017 3:01 am

Sig Figs

Postby Jennifer Torres 2L » Thu Oct 04, 2018 10:32 pm

Hello, I have forgotten the specific rules for sig figs when dividing, multiplying, adding and subtracting could someone please give me a breifing?

Melissa Villanueva1K
Posts: 64
Joined: Wed Nov 15, 2017 3:01 am

Re: Sig Figs

Postby Melissa Villanueva1K » Thu Oct 04, 2018 10:39 pm

For addition and subtraction count the number of significant figures in the decimal part only of each number in the problem. Then just add and/or subtract. Your final answer can have no more significant figures to the right of the decimal than the least number of significant figures in any number in the problem. And for multiplication and division, the least number of significant figures in any number of the problem dictates the number of significant figures in the answer. But when dividing/multiplying you look at the entire number.

Mukil_Pari_2I
Posts: 87
Joined: Fri Sep 28, 2018 12:29 am

Re: Sig Figs

Postby Mukil_Pari_2I » Thu Oct 04, 2018 10:47 pm

Also, for sig fig rounding, if the last digit is above 5 round up (ie 2 sigfigs then 6.56 is 6.7) and if the last digit is below 5 round down (ie 2 sigfigs then 3.44 is 3.4).

Chloe Likwong 2K
Posts: 70
Joined: Fri Sep 28, 2018 12:23 am

Re: Sig Figs

Postby Chloe Likwong 2K » Fri Oct 05, 2018 12:33 am

To provide more clarification:

Addition/Subtraction : The answer should have the "smallest number of decimal places."
For example: 10.2 + 1.005 + 2.35 = 13.555 = 13.6. (10.2 has one decimal present, thus, we "follow" it)
4.505 - 2.3 = 2.205 = 2.2

Multiplication/Division : One picks the least amount of significant figures.
For example: 2.3 x 3.570 = 8.211 = 8.2
1.3006 x 3.6 = 4.68216 = 4.7

To acquire more info, just visit this : https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf


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