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I am unsure as to how to round this off.  12.3 times 34.14 = 419.922  but I need it to the least number of SF  of the operandi/measurements given, in this case 3  So 3 significant figures is 419, as i thought first, but then the .9 appears vital to the accuracy of the measurements, so if i ROUND it off, it would be 420, which is only 2 SF and if i did 420.0, that would be 4 significant figures! Am i overthinking it and the answer is simply 419? Also, could the answer be in scientific notation? i.e. 4.20 x 10^2  (it's 3 SF)

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1 Answer

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It should be 3 significant figures as the lowest number of sig figs in the question is 3.

As the .9 rounds up it should be 420 or 4.20 x 10^2. 420 is the most appropriate though.

Hope this helps.

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