Prefixes - yotta zetta exa peta tera giga mega kilo hecto deca deci centi milli micro nano pico femto atto zepto yocto
si prefixes

 METRIC CONVERSION TABLES  
SI Prefixes.

septillion sextillion quintillion quadrillion trillion billion million thousand hundred ten tenth hundredth thousandth millionth billionth quadrillionth quintillionth sextillionth septillionth
Also information on Imperial/Metric Conversion Tables ;
SI Unit Descriptions ; SI Derived Units - in terms of SI Base Units
and the SI Prefixes (giga- , etc.).
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.
FACTOR
...or in full ...
or in
words
SI
PREFIX
SI
SYMBOL
1,0E+24
1,0E+21
1,0E+18
1,0E+15
1,0E+12
1,0E+9
1,0E+6
1,0E+3
1,0E+2
1,0E+1
1,0E-1
1,0E-2
1,0E-3
1,0E-6
1,0E-9
1,0E-12
1,0E-15
1,0E-18
1,0E-21
1,0E-24 		1 000 000 000 000 000 000 000 000
1 000 000 000 000 000 000 000
1 000 000 000 000 000 000
1 000 000 000 000 000
1 000 000 000 000
1 000 000 000
1 000 000
1 000
100
10
0,1
0,01
0,001
0,000 001
0,000 000 001
0,000 000 000 001
0,000 000 000 000 001
0,000 000 000 000 000 001
0,000 000 000 000 000 000 001
0,000 000 000 000 000 000 000 001		 septillion
sextillion
quintillion
quadrillion
trillion
billion
million
thousand
hundred
ten
tenth
hundredth
thousandth
millionth
billionth
trillionth
quadrillionth
quintillionth
sextillionth
septillionth
yotta-
zetta-
exa-
peta-
tera-
giga-
mega-
kilo-
hecto-
deca-
deci-
centi-
milli-
micro-
nano-
pico-
femto-
atto-
zepto-
yocto-
Y
Z
E
P
T
G
M
k
h
da
d
c
m
µ
n
p
f
a
z
y

The scientific notation used in the factors column helps to reduce long numbers to a manageable width. By convention, the number is always shown as a unit [ 1 to 9 ], with decimal places chosen to suit accuracy, and the size of the number is adjusted by changing the magnitude [E+?]. E+01 means moving the decimal point one space to the right so 1.00E+01 is shorthand for 10, then 1.33E+00 stays at 1.33 and 1.33E-01 becomes 0.133. This format tends to be used when the figure gets longer so E+09 or E-09 cuts out a lot of noughts.

Don't confuse scientific notation with powers. You can say, quite rightly, that a million is 10 to the power of 6 [ 10^6 or ] but if you confused it with the scientific notation and had 1^7 the answer would be 1 and not a million ! [ you say one times one is one, seven times, and the answer is still one ]

So it's all a matter of conventions - if we all follow the same rules then the information is passed correctly from one brain to another which is, after all, the object of writing something down.

Note: The prefix hecto- to centi- are not 'preferred prefix' but referred to as 'other prefix' by SI, though centi- is in common use as in cubic centimetre or cc.
Le Système International d'Unités (SI) name the prefix giga and nano, milliard and milliardth respectivly. The wording shown here was approved by the General Conference on Weights and Measures and has been adopted in practice.

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