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Rules for finding Significant Figures of a Number #8211; (1) All non-zero digits are significant, i.e. for 2489, significant figure is 4. (2) All zeroes between two non-zero digits are significant, no matter, where the decimal point, i.e. for 240.02, significant figure is 5. (3) All zeroes to the right of a decimal point and to the left of a non-zero digits are not significant, if the number is less than 1, i.e. for 0.0021, significant digits are 2.
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