10 divided by 3 *multiplied with 3 is not 10 again??

[Lost User]

Technically, 0 is lack of a number. The romans didn't have 0 which limited them mathematically (it was actually invented in India and spread to Europe via Arab traders). Elaine :rose:

The tigress is here :-D

[Jorgen Sigvardsson]

Just because it wasn't discovered until much later, doesn't mean it's not a number[^]. It may not be a natural number per se, but it is a consequence of natural numbers.

-- Pictures[^] from my Japan trip.

[Andy Brummer]

Actually, in mathematics 0.3 is a real number. To a computer with limited precision it cannot be accurately represented, but in general infinitely repeating decimals are definitely real. Even things like pi and e are real numbers even though all their digits cannot be computed. That's what makes the set of real numbers bigger then the set of rational numbers.

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and of course [they] outsource their technical support to a land where English bears little resemblance to the language I speak - Christopher Duncan

[Andy Brummer]

Your teacher was right. All decimals are real even infinitely repeating ones.

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and of course [they] outsource their technical support to a land where English bears little resemblance to the language I speak - Christopher Duncan