Five. Count from the first nonzero digit to the last nonzero digit.
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3 of them.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
3 significant figures.
If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.