Sig Fig in final answer  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Mariane Sanchez 1E
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

Sig Fig in final answer

Postby Mariane Sanchez 1E » Fri Oct 06, 2017 12:10 pm

Hi, just wanted some clarification regarding significant figures.
For example the two given numbers for a problem are as follows: 5.43 and 5.9.
How many significant figures should the final answer be in?

Rain Taganas 1J
Posts: 22
Joined: Fri Sep 29, 2017 7:05 am

Re: Sig Fig in final answer

Postby Rain Taganas 1J » Fri Oct 06, 2017 12:43 pm

In this case, you should use 2 sig figs. When you are given different numbers of sig figs you should use the one with the least amount.

Nicole Nikolov 1K
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Re: Sig Fig in final answer  [ENDORSED]

Postby Nicole Nikolov 1K » Sun Oct 08, 2017 3:11 pm

Your final answer in this case would only have two significant figures. This is because your final answer can only be as precise as the least precise value you used in your calculations.

Posts: 17947
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 406 times

Re: Sig Fig in final answer

Postby Chem_Mod » Sun Oct 08, 2017 3:28 pm

In this case, your final answer would have 2 sig figs. However, you should note that sig figs for multiplication and division is different from addition and subtraction. In multiplication and division, you always leave final sig figs to the smallest number of sig figs from information given. In this class, it is not often that you will encounter adding/substracting in your calculations, but when you add or subtract, you modify your sig figs to the least precise decimal place, and it is very important to note that you should carefully keep track of your sig figs in each calculation if your calculation involves both adding/subtracting AND multiplication/division because your number of sig figs may change every time you do a add/subtract calculation in between multiplication/division calculations.

Return to “Significant Figures”

Who is online

Users browsing this forum: No registered users and 2 guests