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1) As many as you need for a particular purpose.

2) In any case, since this number is probably the result of some calculation, the answer should not look more accurate than what is justified by the original data. For example, if you multiply two numbers, one with 4, one with 5 significant digits, the answer should not have more than 4 significant digits.


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Q: In 711129637.3 how many significant figures should be retained?
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What determines the number of significant figures in density calculations?

The accuracy of the measurement device determines the number of significant figures that should be retained in recording measurements.


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142.617 has 6 significant figures and should not be confused with the number of decimal places to which the number is given which is 3dp. To 5 significant figures, the answer is 142.62 To 4 significant figures, the answer is 142.6 To 3 significant figures, the answer is 142 To 2 significant figures, the answer is 140 (the final zero is retained to indicate the position of the decimal point which , if shown, would be 140.0 To 1 significant figure, the answer is 100


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