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Significant Figures Significant figures are those digits in a measurement that are known with certainty plus the first digit that is uncertain. Example 156.3 cm has 4 significant figures. Rules for significant figures (1) All non-zero figures are significant. 115.32 kg has 5 significant figures. (2) All zeros between non-zero digits are significant. 22004 g has 5 significant figures. (3) Zeros to the right of a non-zero figures, but to the left of an understood decimal point, are not significant unless specifically indicated to be significant by the use of a bar over a zero. 93000 seconds has 2 significant figures. (4) All zeros to the right of a decimal point but to the left of a non-zero figure are not significant. 0.00002243 km has 4 significant figures. (5) All zeros to the right of a decimal point and following a non-zero figure are significant. 0.020400 ml has 5 significant figures. (6) In addition or subtraction, the sum or difference has significant figures only in the decimal places where both of the original numbers had significant figures. 5.2 + 3.1 8.3 6.843 + 1.2 8.0 6.843 +1 8 6.843 - 0.001 6.842 (7) In multiplication and division, the product or quotient cannot have more significant figures than there are in the least accurately known of the original number. That is, count the significant figures in each of the number being multiplied or divided and keep the least amount for the number of significant figures for the solution. 5.2 x 3.1 = 16 5.243 x 3.1 = 16 (8) When rounding off, if the first number to be dropped is: 4 or less round down 6 or greater round up 5 followed by non-zero numbers round up exactly 5 round to the nearest even number.