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. This student is becoming somewhat obnoxious about this. HELP! Who's 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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