500
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Significant figures. For example, 3.4953729 to 3 significant figures would be 3.495
Five. If you write numbers representing the numbers in a calculation or an answer, then the number of significant figures is the number of figures written down. The number of significant figures in 351.739002 is 9; Don't confuse "significant figures" with "decimal places". The number above has 6 decimal places.
221.0988478 Without specific information relating to the format required of the answer then there are 10 significant figures in this number. If the question required the answer to three decimal places then the number would be presented as 221.099 which has 6 significant figures. If the question asked for the answer to the nearest hundred then the answer becomes 200.0 which is correct to 1 significant figure.
37.753 rounded to one significant figure becomes 40
It is: 7000 rounded to 1 significant figure