Really Big and Really Small Numbers
There is some international confusion about how to name big numbers. The number $1,000,000$ is one million all over the world. But Americans read $1,000,000,000$ (= ${10}^{9}$ , or a one with nine zeros) as one billion , while in Britain, they say "one thousand million" for ${10}^{9}$ . For the British, "one billion" means ${10}^{12}$  what most other people call "one trillion". (These days the British are starting to switch over to the American system, at least in the scientific world.)
Also, in India, after $1,000$ , they start putting commas after every two zeros. In India, $100,000$ is one lakh (our one hundred thousand) and $10,000,000$ is one crore (our ten million).
Below are the standard American and scientific names given to really huge numbers and really tiny numbers. You may want to review your properties of exponents and exponent tables . The prefixes are used in the metric system (for example, $1000$ grams is a kilo gram, and $1,000,000,000$ watts is a giga watt.)
BIG NUMBERS


Number

Name

Metric Prefix

${10}^{1}=10$

Ten

deka

${10}^{2}=100$

Hundred

hecto

${10}^{3}=1000$

Thousand

kilo

${10}^{4}=10,000$

Ten Thousand

myria

${10}^{6}=1,000,000$

One Million

Mega

${10}^{9}=1,000,000,000$

One Billion

Giga

${10}^{12}$

One Trillion

Tera

${10}^{15}$

One Quadrillion

Peta

${10}^{18}$

One Quintillion

Exa

${10}^{21}$

One Sextillion

Zetta

${10}^{24}$

One Septillion

Yotta

${10}^{27}$

One Octillion


${10}^{30}$

One Nonillion


${10}^{33}$

One Decillion


${10}^{36}$

One Undecillion


${10}^{39}$

One Duodecillion


${10}^{42}$

One Tredecillion


${10}^{45}$

One Quattuordecillion


${10}^{48}$

One Quindecillion


${10}^{51}$

One Sexdecillion


${10}^{54}$

One Septendecillion


${10}^{57}$

One Octodecillion


${10}^{60}$

One Novemdecillion


${10}^{63}$

One Vigintillion


${10}^{100}$

One Googol (named by a nineyear old kid named Milton Sirotta in $1938$ ... but it's in the dictionary! Note that it's spelled differently than that website.) 

${10}^{303}$

One Centillion


${10}^{{10}^{100}}$
(that's a $1$ with ${10}^{100}$ zeros!) 
One Googolplex ("the largest number with a name") 
SMALL NUMBERS


Number

Name

Metric Prefix

${10}^{1}=0.1$

One Tenth

deci

${10}^{2}=0.01$

One Hundredth

centi

${10}^{3}=0.001$

One Thousandth

milli

${10}^{6}=0.000001$

One Millionth

micro

${10}^{9}=0.000000001$

One Billionth

nano

${10}^{12}$

One Trillionth

pico

${10}^{15}$

One Quadrillionth

femto

${10}^{18}$

One Quintillionth

atto

${10}^{21}$

One Sextillionth

zepto

${10}^{24}$

One Septillionth

yocto
