Is 3.9 an odd number?

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marcus888
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#1
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Hi, it says on the BBC bitesize website that:

"Image isn't an odd number because it's not a whole number (that is, it doesn't belong to the set of numbers Image, Image, Image, Image, Image, Image, Image, Image)."

So does that mean it is even or classed as something else?
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That_Punk_Life
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Now we're asking the real questions
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Muttley79
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(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

"Image isn't an odd number because it's not a whole number (that is, it doesn't belong to the set of numbers Image, Image, Image, Image, Image, Image, Image, Image)."

So does that mean it is even or classed as something else?
Only integers (whole numbers) can be classed as odd or even.
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SamuelSingleton
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It's a rational number so it's not classed as odd or even ..
that being because 3.9 can have a 0 added onto it to make 3.90 which is the same value as 3.9
but you've been taught that anything with a "0" on the end is even... so therefore rational numbers could be both even and odd simultaneously
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username1732133
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(Original post by SamuelSingleton)
It's a rational number so it's not classed as odd or even ..
that being because 3.9 can have a 0 added onto it to make 3.90 which is the same value as 3.9
but you've been taught that anything with a "0" on the end is even... so therefore rational numbers could be both even and odd simultaneously
Rational numbers can be odd/even. 6, for example, is even.
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DFranklin
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(Original post by SamuelSingleton)
It's a rational number so it's not classed as odd or even ..
Incorrect: all odd/even numbers are also rational numbers.

The key point here is that it is not an integer. Odd/even only makes sense for integers.
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Smaug123
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(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

"Image isn't an odd number because it's not a whole number (that is, it doesn't belong to the set of numbers Image, Image, Image, Image, Image, Image, Image, Image)."

So does that mean it is even or classed as something else?
By analogy, "apple" isn't an odd number because it's not a whole number; \infty isn't an odd number because it's not a whole number; and so on. They aren't even either.
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Gadah.Bengalha
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alay
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Kakemono
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Wikipedia:
An odd number is an integer which is not a multiple of two. If it is divided by two the result is a fraction. One is the first odd positive number.
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nk02
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What an odd question to ask Marcus.
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Tootles
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#11
(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

"Image isn't an odd number because it's not a whole number (that is, it doesn't belong to the set of numbers Image, Image, Image, Image, Image, Image, Image, Image)."

So does that mean it is even or classed as something else?
Odd numbers and even numbers are integers. 3.9 is not an integer, so it's neither odd not even. It's a "real" number.

Shitballs, I just realized I fell for a necro and sent the reply anyway. Dammit :getmecoat:
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Ryanzmw
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(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

"Image isn't an odd number because it's not a whole number (that is, it doesn't belong to the set of numbers Image, Image, Image, Image, Image, Image, Image, Image)."

So does that mean it is even or classed as something else?
Odd and even is a notion that only applies to integers.
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