# Lecture 3 - numbers numbers RulesforRound

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Rules for Calculating Numbers: Multiplication or division Significant figures used is the smallest  number of significant figures in the original  numbers Addition or subtraction answer can’t have more digits to the right of  the decimal point than any of the original  numbers.

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Rules for Rounding Numbers If the first digit removed  is less than 5  round down If the first digit removed  is greater than 5  round up If the first digit removed  is 5 and following  numbers are nonzero   round up If the first digit removed  is 5 and following  numbers are zero   round down
Conversion Factors Dimensional-Analysis method  uses a  conversion factor to express the  relationship between units. 1 inch (in) = 2.54 centimeters (cm) Convert 3.67 inches to units of cm Convert atmospheric pressure in units of  atmosphere (atm) to pounds per square inch (psi) 1 atm = 14.7 psi P=5 atm what is it in psi?

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Chapter 2 Atoms and Molecules Road Map 2.1  Insight into Polymers (later) 2.2 Atomic Strucuture and Mass 2.3 Ions 2.4  Compounds and Chemical Bonds 2.5  Periodic Table 2.6  Inorganic and Organic Chemistry 2.7  Chemical Nomenclature 2.8  Insight into Polyethylene
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Lecture 3 - numbers numbers RulesforRound

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