1000, or one thousand, is the natural number that comes after 999 and before 1001. In **most English-speaking nations**, the thousand units are separated by a comma: 1,000. But they can also be separated by a period: $1,000. Or even by **both a period** and a slash: /100/10.

There are also many ways to express 1000 in mathematics. Here are some common methods:

The lowest unit is 0, which when multiplied by itself produces 1000. For example, 0 × 0 = 0, but 1 × 1 = 1.

A common mistake people make is to assume that because 0 times anything equals 0, then any number divided by 0 will also equal 0. This is not true. If you divide 100 by 0, you get infinity, not zero. However, if you multiply zero by any number other than 1, you will always get zero: 0 × any number other than 1 = 0.

Another way to write 1000 is as a fraction with no digits after the decimal point: 0.00. Or as two separate fractions: 0 + 0.00 = 0.00.

It is a common mistake to consider 1020 to be the next number after 1000; however, this number only has three digits and is not unique. There are no other numbers that can be added to 1000 that will produce a result with four digits.

There are two ways to create a unique identifier with four digits: either use 000 as the first digit, or use 9999 as the first digit. Thus, the fourth digit must be 0 for **these identifiers**. This means that they will never have **an actual use** but might as well be used for **demonstration purposes**. There are no other options for the first three digits of an ID.

The number 1000 is important in mathematics and science. It appears in many formulas that help scientists understand our world and make discoveries about it. For example, physics uses the inverse square law to explain how gravity works. This law says that the force of attraction between two objects decreases as the distance between them increases, but it does so at a constant rate. That means that if you know the distances between two objects and the force of gravity between them, you can calculate the amount of mass that each object contains.

One million (1,000,000), sometimes known as one thousand thousand, is the natural number that comes after 999,999 and before 1,000,001. It is so named because it is made up of one thousand units of 100 grams each. The common term million written out in full words is milliard.

Million comes from **Latin mille**, meaning "thousand" and thus refers to a number with thousands of digits. Because of this reason, a million can be written as M, MM, MG, MB, BM, or BB.

A billion is a million millions. It is the largest number that can be written without any leading zeros. A billion has two letters: b and l. It is the largest number that can be written with only two different symbols—no numbers or letters are lost by limiting yourself to these two characters. A billion can be divided into **10 million blocks** of 100 bytes each. In other words, a billion bytes of data would be able to be divided into 10 separate files of 100,000 bytes each.

A trillion is a million billions. It is the number that comes after a million billions and before **a million trillions**. Like a billion, a trillion has **two parts**: biliion and tyliard.

100,000 (one hundred thousand) is the natural number that comes after 99,999 and before 100,001. It is expressed in scientific notation as 105.100,000.

← 99999 100000 100001 → | |
---|---|

Cardinal | one hundred thousand |

Ordinal | 100000th (one hundred thousandth) |

Factorization | 25 × 55 |

Greek numeral |

100,000 (one hundred thousand) is the natural number that comes after 99,999 and before 100,001. It is expressed as 105 in scientific notation.

American author Henry David Thoreau wrote about his experience with this number in his book Walden: "There are only two ways to live your life. One is as though nothing mattered; the other is as if everything mattered.

The former method leads to mediocrity, while the latter leads to greatness.

So, how do you write 100,000? You start by writing 9,999. Then you multiply it by 10. So, now you have 90,000. You keep multiplying by 10 until it gets to 100,000.

This is how people who matter do things.

The word comes from the early Italian millione (milione in modern Italian), which is made up of mille, which means "thousand," and the augmentative suffix "one."

There are other ways to express **this number** in words. A common way in English is simply one million. However, if you want to specify exactly how many million there are, then you can say four million and twenty-five thousand or one hundred sixty-four thousand.

Natural numbers that are equal in magnitude but have different names are often called duals. For example, there are true duals of millions such as billion and trillion. There are also true duals of thousands such as million and micromillion. However, a million and a thousandfold million are not true duplicates because they have **different units**.

In mathematics and physics, a number with infinite digits is said to be infinite. Numbers that are not infinity but rather too large to be counted are called infinite sets. Infinite sets can also be called countably infinite or numerable. An example of an infinite set is the set of positive integers (including 0). An example of a non-countably infinite set is the set of **all real numbers**.

The concept of infinity was first proposed by mathematicians including Pythagoras and Plato.