Sig Figs when mult. and div.  [ENDORSED]

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Nicola Higgins 14B
Posts: 103
Joined: Fri Sep 24, 2021 5:41 am

Sig Figs when mult. and div.

Postby Nicola Higgins 14B » Sun Oct 10, 2021 11:25 pm

Is there a rule we follow when multiplying and dividing numbers where sig figs are specified? What if the 2 numbers have different amounts of sig figs?

Nova Akhavan 2F
Posts: 67
Joined: Fri Sep 24, 2021 6:05 am

Re: Sig Figs when mult. and div.

Postby Nova Akhavan 2F » Sun Oct 10, 2021 11:29 pm

When multiplying and dividing sig figs your product should have the lowest number of sig figs found in the problem. For example 42.005 x 1.01 = 42.4

Milli Zunich 3I
Posts: 100
Joined: Mon Nov 16, 2020 12:18 am

Re: Sig Figs when mult. and div.

Postby Milli Zunich 3I » Sun Oct 17, 2021 11:02 pm

Yea like the person before said, the smallest number of sig figs carries over for multiplication and division. For adding and subtracting though, you keep the value with the least specific decimal place. For example, if the question has 2.3 + 2.34, your answer would be to the tenths place as it has the least specific value.

Trisha Badjatia 2L
Posts: 109
Joined: Fri Sep 24, 2021 6:54 am

Re: Sig Figs when mult. and div.

Postby Trisha Badjatia 2L » Sun Oct 17, 2021 11:11 pm

You should always use the same number of sig figs as the number with the lowest number of sig figs (when multiplying/dividing).

Sally_Luo_3F
Posts: 85
Joined: Fri Sep 24, 2021 5:29 am

Re: Sig Figs when mult. and div.

Postby Sally_Luo_3F » Mon Oct 18, 2021 1:45 am

for sigfig in multiplication and division, you always look at the one that has the lowest amount of sigfig and apply that number of sigfig to the final answer.

Chance Lee 1G
Posts: 52
Joined: Fri Sep 24, 2021 7:31 am

Re: Sig Figs when mult. and div.

Postby Chance Lee 1G » Mon Oct 18, 2021 2:34 am

Regarding rules for significant figure rules for multiplication and division, the number that contains the lowest number of sig figs within that calculation involving multiplication and/or division would determine the number of significant figures for the final answer.

amreen_sandhu1k
Posts: 101
Joined: Fri Sep 24, 2021 6:10 am

Re: Sig Figs when mult. and div.

Postby amreen_sandhu1k » Mon Oct 18, 2021 2:51 am

I would really recommend looking at Dr. Lavelle's sheet on SigFig rules on his chemistry website since the correctness of our answers are going to base don that. Additionally, I think you're going to be fine regardless since the midterm is multiple choice and you will most likely be able to reason out the correct answer.

Maggie Clark
Posts: 100
Joined: Fri Sep 24, 2021 7:34 am

Re: Sig Figs when mult. and div.  [ENDORSED]

Postby Maggie Clark » Mon Oct 18, 2021 10:37 am

You should use the number of sig figs that the lowest factor has

Neha Mukund
Posts: 109
Joined: Fri Sep 24, 2021 5:23 am

Re: Sig Figs when mult. and div.

Postby Neha Mukund » Fri Oct 22, 2021 3:33 pm

When doing operations like multiplying and dividing, you should round your final answer to the lowest number of sig figs given in the problem. Hope that helps.

Abby Freeman 1C
Posts: 41
Joined: Mon Jan 09, 2023 2:30 am

Re: Sig Figs when mult. and div.

Postby Abby Freeman 1C » Fri Jan 20, 2023 10:36 am

What is a safe number of sig figs to use when you're multiplying or dividing a large decimal number given from your calculator (with like 8 digits)? (Referring to steps before using the appropriate amount of sig figs in the final answer).


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