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Originally Posted by ngreen
I think for number 4 it would be 3 sig figs since the sin(76) = .970295.....
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No. If a problem gives you 76 as the measure of an angle, then you must round your result to the # of sig figs of that given angle. sin(76) would need to be rounded to 2 sig figs if that's the only calculation - 0.57
Heh, I looked at #1 too fast and thought it was multiplication: "1314.459 + 3.01: 3 sig"
For addition and subtraction, you take the least # of digits after the decimal and make sure your answer has that # of sig figs. 1314.459 + 3.01 would equal 1317.47 (rounding to 2 sig figs after decimal).
If you had to add 0.000000001 to 1.1, you'd get 1.1. Because the limiting sig fig is from 1.1.