Unbelievably fast mental calculations!

Identity · 2007-08-03 05:31:20

When I first saw this I was ! I've known that people who study Vedic Mathematics can use various tricks to speed up calculations but this is something else.

http://www.youtube.com/watch?v=EueFhYZ4HxI&

Daniel123 · 2007-08-03 06:02:34

Wowwww that was amazing.... at the end when he was using his imagination... unbelievable.

luca-deltodesco · 2007-08-03 07:50:24

wow... thats just mad.

Ricky · 2007-08-03 08:19:05

Only about 4 more orders of magnitude to go until he starts to compete with a real computer.

I have to say, interesting, but complete waste of time. Imagine how much you would know if you spent those 2 hours a day and 10 on the weekends studying actual maths. That would be impressive.

krassi_holmz · 2007-08-03 08:21:48

Calculating on a mental abacus? Cool!

luca-deltodesco · 2007-08-03 09:07:05

maybe so ricky for speed, but i took a bit searching and found in a competition, someone working on a calculator and someone working on a mental abacus, the abacus guy did calculations 4x faster than the calculator for things like square roots and stuff

Ricky · 2007-08-03 09:11:43

You have to compare apples to apples, luca. A person working out of a booklet has the questions all formatted and ready for him to go. The same must be done for a computer. Otherwise it is an unfair comparison. To make an analogy, what you are talking about is having someone write down the next question only after the previous one has been computed.

luca-deltodesco · 2007-08-03 09:22:14

i was just referring to speed itself, im not talking about large calculations, i mean single calculations like sqrt(1.245) or whatever, not things like sqrt(1.154*1535sqrt(1.5)) or something. i was just talking about speed itself

Ricky · 2007-08-03 09:45:08

But you're including in there the time it takes to tell the calculator what to calculate. What I'm saying is that if you are to do so, you must include the time it takes to tell a person what to calculate. And if you are to hand a person a sheet which the person can decipher at their own pace, the same must be done for the calculator.

luca-deltodesco · 2007-08-03 09:50:57

i know what you mean, but when youre working things out, if you work them out in your head, and can do it much faster than if you had to use a calculator, practical use of it, then you have to include the extra time needed in using a calculator.

Identity · 2007-08-03 18:50:36

Learning the abacus actually seems like a pretty fun thing to do, and yeah, they have conducted competitions and the abacus usually beats the electronic calculator.

Laterally Speaking · 2007-08-04 04:30:53

Yes, because it takes time to type in the calculation on the calculator. However, if you didn't include this time, it would no longer be much of a competition. I think the point here is that it's faster to use an abacus (imaginary or not) than it is to use an electronic calculator.

George,Y · 2007-08-06 02:51:38

Hey guys!

You have missed the points!

Abacus is only good at summations and substractions, only significantly useful in accounting.

While a Slide Rule can do various jobs without hard and long training.

BTW:
They are Koreans.

I was born in a country where some abacus training was delivered but I don't use it now. I use a slide rule quite often now.

And typing data can be very exhausting. Sheer dirty work yet sometimes social researchers have to do it because the values was defined by themselves. i.e. Determine the correlation between the maths score and whether coming to Mathsisfun. You have to type in 1 if coming and 0 if not coming on your own. When sample is large and such 0-1 variables many it will be so boring!

luca-deltodesco · 2007-08-06 09:48:57

abacus isnt just addition/subtraction, its multiplication/division and square roots/cubic roots aswell

George,Y · 2007-08-06 21:53:59

but how many rules are there you have to remember?

landof+ · 2007-09-05 12:25:21

more than a calculator, I suppose, but you can't cube root a number in 1 step using a calculator. you can only sqrt it 2 times..... what a waste of time. Does it apply to all numbers?

krassi_holmz · 2007-09-06 08:18:51

Whatch this:
http://youtube.com/watch?v=b7fdXLevYvI&

John E. Franklin · 2007-09-06 18:43:47

That's really amazing krassi, the 62/167.
I double checked the number with a calculator I wrote in C, and I
noticed he says it right after learning the language, but
the visual overlay has two digits swapped, a 6 and a 7.
See my comment below the video, by pine-tree-winter, that's me!!

landof+ · 2007-09-08 01:02:21

Crazy and unbelievable. Totally mad.

mathslackers · 2007-09-16 00:45:49

In some countries like singapore, they are making it compulsory for primary 2 and 3 kids to learn the basics of abacus. I think that it really comes in useful when you are not allowed a calculator in the exam. Those who learn abacus do have a better advantage. But, they need to practice for years before they can really get their hands to move that fast. I remember when I first learnt abacus, I used to accidentally hit my beads and there goes my hard worked out answers.

landof+ · 2007-09-16 01:12:35

I've tried hands-on an abacus, and I can't even do

5
4
3
---

in 10 seconds... I'm horrible at it, sometimes even forgetting the proper rules!

mathslackers · 2007-09-16 01:18:43

thats difficult if its the first time your are trying. plus 5, plus 4, minus 7, plus 10. If the problem is the time, well, you need alot of practice before you become familiar with the abacus, I remember having trouble for months!

John E. Franklin · 2007-09-19 01:42:30

You could use an abacus for base-9 or 8 or 7, just tape the unneeded beads to the side.

glenn101 · 2008-04-03 20:16:38

That is....... INSANE!

tereline · 2008-04-25 07:45:42

The abacus method is very powerful but takes lot of dedication and man hours to master. The vedic Maths ( ancient indian tricks ) are equally effective and can be learnt by anyone in hardly few minutes. Like you can learn to find squares of numbers in your head by watching video at this url

Fast mental Math tricks n techniques ( secret ) to end daily mental math problems. Fun Mental Math for kids. Vedic Mathematics

Last edited by tereline (2008-04-27 08:41:53)

Math Is Fun Forum

#1 2007-08-03 05:31:20

Unbelievably fast mental calculations!

#2 2007-08-03 06:02:34

Re: Unbelievably fast mental calculations!

#3 2007-08-03 07:50:24

Re: Unbelievably fast mental calculations!

#4 2007-08-03 08:19:05

Re: Unbelievably fast mental calculations!

#5 2007-08-03 08:21:48

Re: Unbelievably fast mental calculations!

#6 2007-08-03 09:07:05

Re: Unbelievably fast mental calculations!

#7 2007-08-03 09:11:43

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#8 2007-08-03 09:22:14

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#9 2007-08-03 09:45:08

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#10 2007-08-03 09:50:57

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#11 2007-08-03 18:50:36

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#12 2007-08-04 04:30:53

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#13 2007-08-06 02:51:38

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#14 2007-08-06 09:48:57

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#15 2007-08-06 21:53:59

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#16 2007-09-05 12:25:21

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#17 2007-09-06 08:18:51

Re: Unbelievably fast mental calculations!

#18 2007-09-06 18:43:47

Re: Unbelievably fast mental calculations!

#19 2007-09-08 01:02:21

Re: Unbelievably fast mental calculations!

#20 2007-09-16 00:45:49

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#21 2007-09-16 01:12:35

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#22 2007-09-16 01:18:43

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#23 2007-09-19 01:42:30

Re: Unbelievably fast mental calculations!

#24 2008-04-03 20:16:38

Re: Unbelievably fast mental calculations!

#25 2008-04-25 07:45:42

Re: Unbelievably fast mental calculations!

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