[Bjc51192]

1 How many significant figures would be shown in the correct answer to the following problem

(9.60+0.5)(5.35-4.505)/6.2513

I did each individually 9.60 + 0.5 = 10.1  5.35-3.505=0.845 
10.1* 0.84=8.5    8.5/6.2513=1.359 or 1.4
I dont understand how the number of sig figs to this problem would be 3.


2. Calculate the following answer and represent it with the correct significant figures
(1.245 * 243) + (421.1 * 0.02)
(302) 3 sig figs + ( 1 sig fig

302+8=310 Here is where I get confused what I would originally think is the answer would be 3*10^2

But the answer is 3.11*10^2 why is the answer to 2 decimal places?

[rabolisk]

I think 1 should have 2 sig figs.

For 2, you should have 3 sig figs because of the addition rule. If I gave you 302 + 8, and asked you to state the answer, you wouldn't say 300, but 310.

[JustinCh3m]

From 302 + 8.

Addition rules, so answer goes to the "ones place" which gives you 310.

You say the answer is 311.  This too is to the "ones place" and my only guess is that this answer is a result of different rounding??  Not sure. But I get 310 (assuming that you have no typos in your post)  :-)