OT: Simple maths question

I heard this on a gameshow: "Answer quickly, what's half of 99?" - Allegedly most people say 44.5. Why? I said 49.5. I halve 100 then take another half off. Or you could halve 90 then add half of 9. Either way, how can people make this mistake?
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Because they can't do sums (it's not maths, it's arithmetic).
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legedly

her half

people

How do these people get by? I wonder if they all get short changed? Only the other week Aldi tried to give me ฃ10 less change than I should have got - although he did seem a bit confused, he was new there.

I'm not pedantic, I call them all maths.
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wrote:

They don't need to do mental arithmetic often enough to matter.

Unlikely when most flash their card and so there is no change.

More fool you for not using your card or phone.

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Another reason to use the self service checkout if paying cash. Or pay by card.
Very interesting that these 'genuine' mistakes at the checkout are almost always in favour of the store.
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*I went to school to become a wit, only got halfway through.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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On 16/05/2018 10:32, Dave Plowman (News) wrote:

They probably aren't but how many when given ยฃ10 too much are going to make a fuss about it?
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ould

by

I just check my change, but I use self service anyway as it's faster, but not all supermarkets have those. My Asda does, but Morrisons only have them for people with mini baskets, and Aldi and Lidl don't have them at all.

ost

Or more likely the checkout worker. It seems to be a standard thing, not noticing you've given them a ฃ20. Some people actually say 20 out loud when they hand one over.
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On 5/15/2018 5:01 PM, Jimmy Wilkinson Knife wrote:

Many people are dumb. I took half a hundred and took off another half.
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Exactly what I did. I was surprised when John Richardson (the OCD and clever comedian) got it wrong, but then maybe that was staged.
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On 15/05/2018 22:01, Jimmy Wilkinson Knife wrote:

Half of 66 is 33; half of 88 is 44; half of 99 is...
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For those who don't understand the difference between odd and even numbers that they should have been taught in year one of arithmetic.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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Four-and-half-ty, four and a half
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Chris Green
ยท

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Exactly, which when added together make 49 and a half. I still can't think of how to make ther glaring error above.
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On 05/16/2018 11:43 AM, Jimmy Wilkinson Knife wrote:

What if you dropped the first .5 you came across, and forgot to pick it up.
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When doing maths in my head, I often forget numbers, but I know I've forgotten them and start again, much like when typing I can feel I've hit two keys or ther wrong key.
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I actually add up like that sometimes. I'll come to an answer of twelvety three. It's interesting that some people immediately know what number that is and some don't.
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On 05/16/2018 11:44 AM, Jimmy Wilkinson Knife wrote:

123?
Essentially I applied the "distributive property of multiplication over addition" rule (but it was much easier, since I wasn't explaining it too). I separated 99 into 100 and -1, numbers easy to divide by 2, and then put them back together.
BTW, "where's the 44.5?" reminded me of the 1980's Burger King commercials where someone was saying "Where's the beef?".
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Yes. Eighty, ninety, tenty, eleventy, twelvety.

Yes, same here.

Dunno, I always fast forward ads.
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On 05/16/2018 10:44 AM, Jimmy Wilkinson Knife wrote:

It must be some obscure Scottish logic that makes it forty and four.
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On 05/16/2018 05:19 AM, Chris Green wrote:

Which is equal to 49.5, as in 4.5 * 10^1 + 4.5 * 10^0 = 45 + 4.5 = 49.5
BTW, to get that REALLY correct, replace 10 with r and specify that r 10. r^1 = r and r^0 = 1.
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