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How many significant figures are in 900?

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If the zeros are significant figures then 900 is correct to 3 significant figures.
If rounding off has occurred then the answer could be 1 sf or 2sf.

For example : If the original number was 903 and rounding off to the nearest ten was required then 900 is correct to 2 significant figures.
If the number was 927 and rounding off to the nearest hundred was required then 900 is correct to 1 significant figure.
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