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### Naming Numbers

```Date: 09/26/2002 at 10:15:59
From: Susan Guest
Subject: Naming numbers

I am a fifth-grade math teacher. I have a student who insists that
2400 (twenty-four hundred) is not a number. It can only be named as
2,400 (two thousand four hundred). I know that it is not a COUNTING
number, but it is naming a quantity and should be considered a number.
right?
```

```
Date: 09/26/2002 at 10:46:39
From: Doctor Ian
Subject: Re: Naming numbers

Hi Susan,

By the same logic, 'four hundred' wouldn't be a number either, would
it?  After all, when you say 'four hundred', you're implying that
you're multiplying one hundred by four.

Any number can be called by a variety of names. For example, here are
just a few names for 2400:

two thousand four hundred

twenty-four hundred

two point four times ten to the third power

two hundred dozen

one hundred twenty score

sixteen and three-fourths gross

I'll close with this excerpt from the _Chicago Manual of Style_ (14th
ed.), Section 8.2, 'General Principles':

If a number between one thousand and ten thousand
can be expressed in terms of hundreds, that style is
preferred to numerals:

In response to the question, he wrote an essay
of fifteen hundred words.

So I think it's pretty clear which of you is right.

Does this help?

- Doctor Ian, The Math Forum
http://mathforum.org/dr.math/
```
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