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Sir,

As in a grammar it was written that when a number precede thousand and hundred we usually do use plural form of "thousand" and "hundred" such as "two hundred" or "three thosand".

But ,while doing an excercise in math I have to expand number

4375= 4 thousands + 3 hundreds + 7 tesns + 5 ones.

Why hare "thousands" and "hundreds" have been used?

Thanks.
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There is no necessary accounting for mathematical terminology, any more than there is for that of any other English for Special Purposes, in terms of accepted grammar.

However, I would suggest that we are not talking about numbers in the normal sense (like 4 thousand soldiers), but are speaking of what is called the 'thousands' position (the fourth from the right) in the decimal number system-- that is, the position where thousands appear, whatever the quantity we have of them (3, 4, 5, or whatever).

Does that help?