G=Giga
10^9=1 billion
M=megahertz
10^6=1million
K=kilometer
10^3=1000
D=decimal
10^-1=0.1
C=centimeters
10^-2=0.01
M=milliliters
10^-3=0.001
Micrometer=
10^-6=0.000 001
N=nanometers
10^-9=0.000 000 001