Need Help from a Math Teacher

[EMSimon]

:ear

[Peter_Krynicki]

When I was a little kid in school in Germany, we learned about "Quersumme" in math.
This describes the sum of the digits of a multiple digit number:

285 = 2+8+5 = 15, 1+5 = 6. 6 is the "Quersumme" of 285. The rule is, the Quersumme is a 1-digit number.

Question is, does the English language have a word for this and if so, are there different words for the first addition (15 in above example) and the final one (6)?

How 'bout from a Philosophy major?

The first addition gives you the "digit sum". You get down to a single digit by an "interated digit sum."

[MCMXCIVRS]

Seems to have even less practical application than the trigonometry and algebra we had to learn. :scratch

:laugh:laugh

[seniorasi]

When I was a little kid in school in Germany, we learned about "Quersumme" in math.
This describes the sum of the digits of a multiple digit number:

285 = 2+8+5 = 15, 1+5 = 6. 6 is the "Quersumme" of 285. The rule is, the Quersumme is a 1-digit number.

Question is, does the English language have a word for this and if so, are there different words for the first addition (15 in above example) and the final one (6)?

Mike,or anyone that wants to answer: interesting concept. Where would this number be applied?

[98lee]

Thanks, 25, ..eerrr.. 75571:thumb

Actually that would be 7, not 25. Right? 2+5=7


And my bikes would be K3Ss. Or if I took them as a group K9Ss.


Very valuable info.:hungover


:dance:dance:dance

[98lee]

Where would this number be applied?

On internet forums.:brad


:dance:dance:dance

[jforgo]

The "Quersumme" , which I have never heard of, as a functional concept, can serve as a check number that the original long number is transcribed accurately, other than a transposed digit.

AFAIK the more esoteric, numorological function may the the more significant one.

[Mika]

Thanks for an ah ha moment. Your explanation of an application reminded me of a program development meeting that this was mentioned in. I feel so much better now, confused but better.

[queretaro]

The "Quersumme" , which I have never heard of, as a functional concept, can serve as a check number that the original long number is transcribed accurately, other than a transposed digit.

AFAIK the more esoteric, numorological function may the the more significant one.

What am I missing here?
32552 is 17
17 is 8

32255 is 17
17 is 8

anyway you add the digits in the original number gives 17.

Mark

[Mika]

What am I missing here?
32552 is 17
17 is 8

32255 is 17
17 is 8

anyway you add the digits in the original number gives 17.

Mark

The exception in his explanation was a number transposition. There is a check for that also but I really don't remember that.

[queretaro]

I still don't get it: the sum of 1+2+3+4+5 = the sum of 5+4+3+2+1, or any other order of these numbers.

MD

[108625]

Mike,or anyone that wants to answer: interesting concept. Where would this number be applied?

Why, on the sticker price of course!

[Peter_Krynicki]

The "Quersumme" , which I have never heard of, as a functional concept, can serve as a check number that the original long number is transcribed accurately, other than a transposed digit.

AFAIK the more esoteric, numorological function may the the more significant one.

This is like the old "odd" or "even" parity check used to verify the reception of data after transmission. IIRC One extra digit to tell if the sum of the transmitted byte was odd or even.

[redsky49]

Isn't this the basis of the science behind the flux capacitor?

It is interesting that someone still remembers such a thing so many years later. What else do we have tucked away in the dusty corners of our minds?

[crazydrummerdude]

Never heard of such a thing..

Now I'm going to get OCD and do this all day long..