Significant Figures

Rules 1.All nonzeroes are significant 2.Zeroes in-between are significant 3.Zeroes to the left are not significant 4.Zeroes to the right are not significant unless they follow a decimal. 5.All numbers in scientific notation are significant 6.Exact numbers are obtained by counting or definitions such as 1 in = 2.54 cm, and are considered infinite in significance

Adding and Subtracting Always use the least significant decimal place. example: or = round up = or X 10 -2

Multiplying and Dividing All ways go by the least number of significant figures. examples: X 1.1 = No only 2 sig figs, so 1400 or 1.4 x ÷ = but this is rounded to 4 sig figs so 51.36

Combining the math X.033 = following the order of operations =.003 which is reduced to 1 sig fig Then when finish the problem using multipling and dividing we must then use the 1 sif fig rule So our answer is or 2 x 10 -5

Give it a try x 100 = – =.0013 which has 2 sig figs. so.0028

Logs what is the log of = antilog of = = = x =2 x

Which are Exact Numbers? 1 dozen eggs 25 students 1000 mm = 1 m 1 km = mi 2.54 cm = 1 in x 10 23