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Significant figures are important to use, even if it means reporting a less accurate number as your official answer, because a result can only be as accurate as the least accurate measure. You have to be honest so that it does not appear to be more accurate of an answer than the equipment used to make the measurement actually allows, and you can do this by controlling the number of digits in your answer.
When finding measurements in general, we tend to approximate numbers (unless it's a definite measurement). The last digit of some measurement, in turn, becomes the least accurate as it's an approximation. Sig figs allow us to find more precise measurements of any given thing as it measures to the most approximated (and least accurate) digit.
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