Arthur Benjamin - Mathemagics & the Future of Math
ฝัง
- เผยแพร่เมื่อ 14 มิ.ย. 2024
- This lecture was recorded on May 30, 2015 at a conference called “In the Year 2525: Big Science, Big History, and the Far Future of Humanity” (May 29-31, 2015) as part of the Distinguished Science Lecture Series hosted by Michael Shermer and presented by The Skeptics Society in California (1992-2015).
The world’s greatest lightning calculator entertains the audience with a dazzling display of mental math, and along the way shows how anyone can learn the techniques he employs to improve their math literacy. This is one of the most entertaining performances ever given at Caltech.
Arthur Benjamin is considered to be the world’s greatest living lightning calculator. If you have never seen him perform, you are in for a treat! Bring your calculators and challenge the master! Dr. Benjamin will not only demonstrate how he does calculations in his head faster than you can with a calculator, he will reveal his secrets and teach you how to do it yourself. Not only will he reveal his own secrets, he will demonstrate how the great lightning calculators of the past did it. Dr. Benjamin is the Smallwood Family Professor of Mathematics at Harvey Mudd College. He has received numerous awards for his writing and teaching, and served as editor of Math Horizons magazine for the Mathematical Association of America. He has given three TED talks, which have been viewed over 10 million times. Reader’s Digest calls him “America’s best math whiz.” His newest book, out this Fall, is called The Magic of Math: Solving for x and Figuring out Why.
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He uses the major system as a mnemonic method so the error happened when he tried to add “rope”. He accidentally added 47 instead of 49.
Great recovery and stage presence. I watch all of his videos cause I’m a huge fan!
Me tooo
I’m a fan now
This guys been doing his show called "Mathemagics" since the 80s and that's when I first saw him as a kid. He is legendary in the math world for racing against calculators. I wish every maths teacher is an passionate as he is.
Amazing. His computational skills are off the scale. Now I like to know how you develope these impressive skills. Ok, talent is needed. But thats not enough.
Loved the show. Hats off😀
Search for Mathemagics
Superb
Wtf
how
N.Y.C. Freddy: Comment: Thank you., Prof. *A. *Benjamin! AMAZING! *Now? (?) Can You 'C-I-R-C-L-E' = = ., me a .. SQUARE? (Instead of Squaring 'me' = a "CIRCLE!") Ha ~ ! **Peace**..
The second one is easy to anybody to do!!!! Look at the number he chose: 9216 (a multiple of 9 !!!!!!!!!!!). He got lucky to have one in the board!! Thus, multiplying this number by any number, the result will be a multiple of 9, too!!! When they are saying out loud the digits in the result, he´s adding all of them. Thus, if the sum add to 22........... the digit that wasn´t said is 5 (to add to 27, next multiple of 9).
The problem arrives when the "hidden" digit is 0 or 9, ´cause the sum of the others are already a multiple of 9.
When I do this trick, I ask first to "cut off the zeros of the result"!!!! Then in the above case, I will know that the hidden digit is 9.
Btw, to get a multiple of 9 at the beginning, ask to write any number (which you don´t see... say 257,648), and then to write ANOTHER number with the SAME digits... let´s say he writes 652,874...... and then subtract the smaller from the other ==> 652,874 - 257,648 = 395,226 ====> a multiple of 9........ ALWAYS!!!
looks like the girl on the far right knows about the missing digit trick haha
im extremely sceptical
practice and technique
I'm actually one of his students at Harvey Mudd College. I got the chance to give him numbers to square on the spot and he did it completely legitimately. I was super impressed.