# How much is 10 in numbers

Metric Numbers(See also Metric/Imperial Conversion Charts and Unit Converter)What is kilo, mega, giga, tera ... ?In the Metric System there are standard ways to talk about big and

## Metric Numbers

(See also Metric/Imperial Conversion Charts and Unit Converter)

## What is kilo, mega, giga, tera ... ?

In the Metric System there are standard ways to talk about big and small numbers:

- "kilo" for a thousand,
- "mega" for a million,
- and more ...

### Example: A long rope measures **one thousand** meters

It is easier to say it is 1 **kilo**meter long,

and even easier to write it down as **1 km**.

So we used **kilo** in front of the word **meter** to make "**kilometer**".

And the abbreviation is "**km**" (**k** for kilo and **m** for meter, put together).

### Some more examples:

Example: You put your bag on a set of scales and it shows 2000 grams, we can call that 2 **kilograms**, or simply 2 kg.

### Example: Teaspoon

A teaspoon holds 5 **thousandths** of a liter (5**1000** of a liter), but it is better to say "5 **milli**liters", or write it simply as **5 mL**.

"kilo", "mega", "milli" etc are called "prefixes":

**Prefix**: a word part that can be added to the beginning of another word to create a new word

So, using the prefix "milli" in front of "liter" creates a new word "milliliter".

Here we list the prefix for commonly used big and small numbers:

## Common Big and Small Numbers**NameThe NumberPrefixSymbol**trillion1,000,000,000,000teraTbillion1,000,000,000gigaGmillion1,000,000megaMthousand1,000kilokhundred100hectohten10dekada**unit1**tenth0.1decidhundredth0.01centicthousandth0.001millimmillionth0.000 001microµbillionth0.000 000 001nanontrillionth0.000 000 000 001picop

Just remember for large values (each one a thousand times bigger):

"kilo mega giga tera"

and for small values (each one a thousand times smaller):

"milli micro nano pico"

### Try To Do Some Yourself!

- How do you refer to a million liters?
- How about one
**billionth**of a meter?

See the bottom of this page for more questions to challenge yourself ...

## How Big Are They?

There is a lot of difference between them. Think in terms of time:A million seconds is about **12 days**

A billion seconds is about **32 years**

A longer list:

- A
**thousand**seconds is about a**quarter of an hour** - A
**million**seconds is about**12 days** - A
**billion**seconds is about 32 years, almost**half a lifetime** - A
**trillion**seconds is about 32,000 years (the last Ice Age finished 12,000 years ago)

## Much Bigger and Smaller

There are also prefixes for much bigger and smaller numbers:

## Some Very Big, and Very Small Numbers**NameThe NumberPrefixSymbol**

Very Big !septillion1,000,000,000,000,000,000,000,000yottaYsextillion1,000,000,000,000,000,000,000zettaZquintillion1,000,000,000,000,000,000exaEquadrillion1,000,000,000,000,000petaPVery Small !quadrillionth0.000 000 000 000 001femtofquintillionth0.000 000 000 000 000 001attoasextillionth0.000 000 000 000 000 000 001zeptozseptillionth0.000 000 000 000 000 000 000 001yoctoy

Also see

Lengths From Very Small

to Very Large

## All Big Numbers We Know**NameAs a Power of 10As a Decimal**Thousand1031,000Million1061,000,000Billion1091,000,000,000Trillion10121,000,000,000,000Quadrillion1015etc ...Quintillion1018

Sextillion1021

Septillion1024

Octillion1027

Nonillion1030

Decillion1033

Undecillion1036

Duodecillion1039

Tredecillion1042

Quattuordecillion1045

Quindecillion1048

Sexdecillion1051

Septemdecillion1054

Octodecillion1057

Novemdecillion1060

Vigintillion10631 followed by 63 zeros!

And a **Googol** is 1 followed by one hundred zeros (10100) :

10,000,000,000,000,000,000,000,000,000,000,000,

000,000,000,000,000,000,000,000,000,000,000,

000,000,000,000,000,000,000,000,000,000,000

Then there is the **Googolplex**. It is 1 followed by Googol zeros. I can't even write down the number, because there is not enough matter in the universe to form all the zeros:

10,000,000,000,000,000,000,000,000,000,000, ... (Googol number of Zeros)

And a **Googolplexian** is a 1 followed by **Googolplex** **zeros**. Wow.

## All Small Numbers We Know**NameAs a Power of 10As a Decimal**thousandths10-30.001millionths10-60.000 001billionths10-90.000 000 001trillionths10-12etc ...quadrillionths10-15quintillionths10-18sextillionths10-21septillionths10-24octillionths10-27nonillionths10-30decillionths10-33undecillionths10-36duodecillionths10-39tredecillionths10-42quattuordecillionths10-45quindecillionths10-48sexdecillionths10-51septemdecillionths10-54octodecillionths10-57novemdecillionths10-60vigintillionths10-63

5627,5632,1927,1928,1929,1930,3473,3474,3475,3476Decimals Ordering Decimals Powers of 10 Doubling Paper Rounding Numbers Unit Converter