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 Post subject: What is the eighth even number?Posted: Mon Aug 01, 2016 10:52 am

Joined: Wed Mar 04, 2009 2:01 pm
Posts: 6694
Location: Herts
Merchant Taylors Maths 2008

Does 0 count as an even number?

Thanks DG

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 Post subject: Re: What is the eighth even number?Posted: Mon Aug 01, 2016 11:45 am

Joined: Thu Aug 13, 2015 3:01 pm
Posts: 437
I was taught that zero is an even number because when divided by 2 the result is a whole number. But then again when I was at school a billion had 12 zeros so who knows what else has changed

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 Post subject: Re: What is the eighth even number?Posted: Mon Aug 01, 2016 1:27 pm

Joined: Wed Jul 20, 2016 3:33 pm
Posts: 36
What I read in my school days: Zero is an even number.

A number is an even number when divided by 2 results as a whole number. TRUE
Some can also state: the number when added 1 should be an odd number. TRUE

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 Post subject: Re: What is the eighth even number?Posted: Mon Aug 01, 2016 2:01 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11952
A tutor should not need to ask this question.

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 Post subject: Re: What is the eighth even number?Posted: Mon Aug 01, 2016 3:13 pm

Joined: Thu Apr 04, 2013 10:39 am
Posts: 653
My feeling is this is another one of those frustratingly ambiguous questions that seem to crop up in some 11+ papers which our kids are expected to muddle through and get to the "right answer". Is this meant to be a discussion question for a 10 year old? Surely

if odd and even are defined over positive integers then 2 is the first even,
if odd and even are defined over natural numbers then 2 is the first even,
if odd and even are defined over 0 and the natural numbers then 0 is the first even,
if odd and even are defined over all integers then minus infinity is the eight even number.

nyr

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 Post subject: Re: What is the eighth even number?Posted: Mon Aug 01, 2016 6:36 pm

Joined: Thu Nov 27, 2014 4:04 pm
Posts: 726
I would have said 0 was not an even number.I would have said the 8th even number was 16. Seems I am in a minority.

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 Post subject: Re: What is the eighth even number?Posted: Mon Aug 01, 2016 6:53 pm

Joined: Sat Jul 24, 2010 9:45 pm
Posts: 1488
nyr wrote:
(...) if odd and even are defined over all integers then minus infinity is the eight even number. nyr
I am now totally confused! And yes, it is a somewhat ambigous question...

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 Post subject: Re: What is the eighth even number?Posted: Tue Aug 02, 2016 8:31 am

Joined: Thu Apr 04, 2013 10:39 am
Posts: 653
Zero is even. The smallest even is minus infinity but that's almost certainly not the expected correct answer so it comes down to the child having to guess what the examiner was thinking. Should they assume the examiner started from 0 or 1? There is a 50% chance of getting it wrong.

nyr

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 Post subject: Re: What is the eighth even number?Posted: Tue Aug 02, 2016 8:49 am

Joined: Wed Jul 01, 2009 1:04 pm
Posts: 1187
Infinity isn't a number though.

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 Post subject: Re: What is the eighth even number?Posted: Tue Aug 02, 2016 9:03 am

Joined: Thu Apr 04, 2013 10:39 am
Posts: 653
What about -63797268368746769876576576476? Or just -2? These are even.

Where should one start?

Assuming the examiner wasn't considering negatives, that still leaves the question of whether to start from 0 or 1.

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