sig figs in addition problems

Moderators: Chem_Mod, Chem_Admin

Posts: 20
Joined: Sat Jul 09, 2016 3:00 am

sig figs in addition problems

Postby Sonia_Lele_2K » Fri Sep 30, 2016 3:03 pm

Is there any specific reason why only the sig figs after the decimal are counted in addition or subtraction problems?

Manali Ghadiali 1E
Posts: 21
Joined: Sat Jul 09, 2016 3:00 am

Re: sig figs in addition problems

Postby Manali Ghadiali 1E » Fri Sep 30, 2016 5:16 pm

The rule for determining significant figures with addition and subtraction problems is to round to the place of the least accurate number. This doesn't necessarily limit the rounding of significant figures to decimal places, but simply to the least accurate place.

223.2 + 14.234 + 6 = 243.434
If this number was to be written with the proper amount of significant figures, the answer would be 243. This is because 6 is only written to the ones place, which means that it is the least accurate digit and therefore the answer should be rounded to that same place.

Return to “Significant Figures”

Who is online

Users browsing this forum: No registered users and 1 guest