0.000 000 000 001
10-12
0.000000001
10-9
10-6
10-4
10-3
10-2
1/10
0.1
10-1
1.        
 101
102
    1,000.
103
104
105
106
109
        10.
    100.
    10,000.
    100,000.
    1,000,000.
    1,000,000,000.
or
1/100
0.01
or
1/1000
0.001
or
1/10,000
0.0001
or
1/1,000,000
0.000001
or
The exponent of 10
The number of times 10 is multiplied by itself to produce a given number
The number of places the decimal point must be moved to be just to the right of the left-most non-zero digit.
100
1/1,000,000,000
or
For numbers greater than 1, the number of  zero’s between the decimal point and the first non-zero digit.
Multiples of 10