2 Significant figures:Are the numbers in a measurement that include all of the digits that are known, plus the last digit that is estimated.
3 Calculating can change the # of significant digits Calculating can change the # of significant digits. The following rules will help you determine how many significant figures a reported measurement has.
4 Rule #1Every non zero number is assumed to be significant.
12 Rule 5 (an exception to rule 4) Numbers that are to the right of a non zero number where there is no decimal present are not significant. Unless it is stated that the measurement is known precisely.
13 Examples: 5000 = 1 significant digits 550100 = 4 significant digits (The zero between the 1 and the decimal is significant because it is between the significant zero’s after the decimal.)
14 Rule 6 You have an unlimited number of significant figs if you : Come up with the number by counting every thing.Are getting the number by converting within a system of measurement.
15 Examples:I counted = 5 significant digitsThere are 1000 meter in 1 Km = 4 significant digitsThere are 3600 seconds in 1 hour = 4 significant digits
16 Calculating Significant Digits When multiplying or dividing measurements, the final answer can not have more sig digs than the measurement with the smallest # of significant digs.