What are the rules for determining significant figures in four fundamental operations?
1. All nonzero digits are significant. 2. All zeroes between nonzero digits are significant. 3. Zeroes to the right of a nonzero digit, but to the left of an understood decimal point, are not significant. If such zeroes are known to have been measured, however, they are significant and should be specified as such by inserting a decimal point to the right of the last zero. 4. In numbers less than one, zeroes to the right of a decimal point that are to the left of the first nonzero digit are never significant. They are simply placeholders. 5. In numbers less than one, the zero to the left of the decimal point is never significant. 6. All zeroes to the right of a decimal point and to the right of a nonzero digit are significant. Addition and Subtraction Involving Significant Figures In addition or subtraction, the arithmetic result should be rounded off so that the final digit is in the same place as the leftmost uncertain digit. Multiplication & Division Involving Significant Figures The
