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# Correct number of sig figs calculation?

30.4 + 8.34 x 12.0. what's the answer to the correct number of sig figs. do I do the multipication first and round before adding and round again? is the answer 130.4 or 130.5?

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- MattLv 79 years agoFavorite Answer
multiply, then round, then add.

8.34*12.0 = 100 + 30.4 = 130, the 0.4 is not a sig fig.

- 9 years ago
8.34 x 12 = 100.08

but the correct number of sigfigs would be 2.

so drop the .08 and keep 100.

30.4 + 100 = 130.4

because one number is after a decimal so your answer has to be as well.

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