## World records?

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• Dear all, Is 79889679*69984778 really of the same difficulty as 23144561*45510343? If anyone wants to do a world record for 8 by 8s then it should definitely
Message 1 of 4 , Dec 2, 2008
Dear all,

Is 79889679*69984778 really of the same difficulty as 23144561*45510343?
If anyone wants to do a world record for 8 by 8s then it should
definitely be an average of a set of problems. Or is there some way to
generate a random yet 'average' single problem?

-Jsh
• No, In my case the 2nd one is much easier and takes less time and the probability of going wrong is also less. For world record - avg of set of problems may be
Message 2 of 4 , Dec 2, 2008
No, In my case the 2nd one is much easier and takes less time and the probability of going wrong is also less.

For world record - avg of set of problems may be right way.

John Louis

--- On Tue, 2/12/08, jsh.flynn <jsh.flynn@...> wrote:
From: jsh.flynn <jsh.flynn@...>
Subject: [Mental Calculation] World records?
To: MentalCalculation@yahoogroups.com
Date: Tuesday, 2 December, 2008, 7:25 PM

Dear all,

Is 79889679*69984778 really of the same difficulty as 23144561*45510343?

If anyone wants to do a world record for 8 by 8s then it should

definitely be an average of a set of problems. Or is there some way to

generate a random yet 'average' single problem?

-Jsh

[Non-text portions of this message have been removed]
• Hi guys,   I d like to add my name to the list of those who say that such a world record should refer to an average (or total) of a group of tasks. This would
Message 3 of 4 , Dec 2, 2008
Hi guys,

I'd like to add my name to the list of those who say that such a world record should refer to an average (or total) of a group of tasks. This would also put it in line with the determination of days for dates.

One question: If a large number of tasks has to be unndertaken, how would the record be referred to? I suggest a minimum of 90% correct answers from a minimum 50 problems, with the average time per correct answer (NOT per problem) be quoted.

Any thoughts on this?

Cheers,

George

p.s. I'm still working on typing up that MC grading proposal - I don't get much computer time.

--- On Tue, 2/12/08, JohnLouis Louis <pjlmem@...> wrote:

From: JohnLouis Louis <pjlmem@...>
Subject: Re: [Mental Calculation] World records?
To: MentalCalculation@yahoogroups.com
Date: Tuesday, 2 December, 2008, 5:02 PM

No, In my case the 2nd one is much easier and takes less time and the probability of going wrong is also less.

For world record - avg of set of problems may be right way.

John Louis

--- On Tue, 2/12/08, jsh.flynn <jsh.flynn@gmail. com> wrote:
From: jsh.flynn <jsh.flynn@gmail. com>
Subject: [Mental Calculation] World records?
To: MentalCalculation@ yahoogroups. com
Date: Tuesday, 2 December, 2008, 7:25 PM

Dear all,

Is 79889679*69984778 really of the same difficulty as 23144561*45510343?

If anyone wants to do a world record for 8 by 8s then it should

definitely be an average of a set of problems. Or is there some way to

generate a random yet 'average' single problem?

-Jsh

Add more friends to your messenger and enjoy! Go to http://messenger. yahoo.com/ invite/

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]
• Dear Josh, My answer on your queston is that - in my opinion - the first question is more difficult than the second one. I adstruct as follows. As I know all
Message 4 of 4 , Dec 2, 2008
Dear Josh,

My answer on your queston is that - in my opinion - the first question is more difficult than the second one. I adstruct as follows.

As I know all the 2×2 multiplications by heart, I do multiplications in groups of 2 digits. I always did and do not like to traine with 1 digit at a time, this will surely confuse me.

The heaviest part form the 4 multiplications - cross method of course - and adding the results of 78×79, 6162 + 69×79, 5451, 84×97, 8148 + 88 × 47, 4136, 23 897 to be increased by the hundreds of the multiplication just before.

The second one: 43×23, 989, +45×61, 2745, +03×14, 42 + 51 ×45, 2295, 6071 + to be increased by the hundreds of the multiplication just before.

I have my questions made by a random generator.

Regards,

Willem Bouman

----- Oorspronkelijk bericht -----
Van: jsh.flynn
Aan: MentalCalculation@yahoogroups.com
Verzonden: dinsdag 2 december 2008 14:55
Onderwerp: [Mental Calculation] World records?

Dear all,

Is 79889679*69984778 really of the same difficulty as 23144561*45510343?
If anyone wants to do a world record for 8 by 8s then it should
definitely be an average of a set of problems. Or is there some way to
generate a random yet 'average' single problem?

-Jsh

[Non-text portions of this message have been removed]
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