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tips for sig digits and rounding - Significant Digits and...

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Significant Digits and Rounding Off Precision of quantitative data is expressed through the use of significant digits, the number of which is defined by the following rules: i. Any non-zero digit is significant. ii. Zeros between non-zero digits are significant. iii. Zeros to the left of the first non-zero digit are not significant. Their purpose is to indicate the placement of the decimal point. iv. If a number is greater than 1, then all the zeros written to the right of the decimal point count as significant digits. If a number is less than 1, then only the zeros that are at the end of the number and the zeros between the non-zero digits are significant. v. For numbers that do not contain decimal points, the zeros after the last non-zero number may or may not be significant, we cannot know without more information. By using scientific notation, however, we can avoid this ambiguity. [Usually we assume the minimum number of significant digits] vi. In addition and subtraction
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