# Is 3.9 an odd number?

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

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

So does that mean it is even or classed as something else?
0
6 years ago
#2
Now we're asking the real questions
5
6 years ago
#3
(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

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

So does that mean it is even or classed as something else?
Only integers (whole numbers) can be classed as odd or even.
0
6 years ago
#4
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
1
6 years ago
#5
(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.
5
6 years ago
#6
(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.
0
6 years ago
#7
(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

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

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; isn't an odd number because it's not a whole number; and so on. They aren't even either.
1
4 years ago
#8
alay
0
4 years ago
#9
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.
0
4 years ago
#10
What an odd question to ask Marcus.
0
4 years ago
#11
(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

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

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
0
4 years ago
#12
(Original post by marcus888)
Hi, it says on the BBC bitesize website that:

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

So does that mean it is even or classed as something else?
Odd and even is a notion that only applies to integers.
0
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