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PostPosted: Thu Oct 05, 2006 8:24 pm    Post subject: Man Recites Pi to 100,000 Places

Man Recites Pi to 100,000 Places

By The Associated Press

posted: 04 October 2006
01:28 pm ET

TOKYO (AP) ─ A Japanese mental health counselor recited pi to 100,000 decimal places from memory on Wednesday, setting what he claims to be a new world record.

Akira Haraguchi, 60, needed more than 16 hours to recite the number to 100,000 decimal places, breaking his personal best of 83,431 digits set in 1995, his office said Wednesday. He made the attempt at a public hall in Kisarazu, just east of Tokyo.

Pi is a physical constant defined as the ratio of a circle's circumference to its diameter.

It is usually written out to a maximum of three decimal places, as 3.141, in math textbooks. But the number, which has fascinated scientists for centuries, has no theoretical limit to the number of decimal places it can be written to. It is a constant that appears in the proofs of many equations defining the universe.

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PostPosted: Thu Mar 16, 2006 3:01 pm    Post subject: (Math) Rational and Irrational Numbers

Student Recites 8,784 Digits of Pi
Associated Press
Wed Mar 15, 10:02 PM ET

A high school student Tuesday recited 8,784 digits of Pi the non-repeating and non-terminating decimal likely placing him among the top Pi-reciters in the world.

Gaurav Rajav, 15, had hoped to recite 10,790 digits and set a new record in the United States and North America. But he remembered enough to potentially place third in national and North American Pi recitation and 12th in the world.

His ranking should be verified by the Pi World Ranking List within two months.

"I'm kind of disappointed, but I guess I did OK," said Gaurav, a junior at Salem High School.

But his mathematical feat won the praise of others, including the math and computer science teacher who got Gaurav interested in it.

"I'm still stunned," said Linda Gooding, one of three contest judges. She then joked, "That's a couple more than I can do."

Gaurav began memorizing Pi while a student in Gooding's class. Gooding holds the competition every year, and said she expected students to learn about 40 digits. Gaurav recited nearly 2,990 the first time.

Gaurav's parents promised him an Xbox 360 video game console if he had reached his goal. His father, Jogesh Rajav, jokingly offered to get him "an Xbox, but no game."

But Gaurav ultimately turned town his mother Seema's offer to buy him the game system anyway because of their deal.

He will try for the record again in May.

Related Lessons (Elementary Level);DocID=247


Questions to explore further this topic:

Rational and Irrational Numbers

What are rational numbers?

Operations with fractions

A Teaching Plan for Fractions

Operations with decimals

What are irrational numbers?

A proof that the square root of 2 is irrational

Examples of Irrational Numbers

What is pi?

Pi and the circumference of a circle

Videos on pi and the circle

The first ten thousand digits of pi

The first 100000 digits of pi

A history of pi

Pi chronology

Pi memorization record holders


Pi trivia

Modern calculation of pi (Gregory, Leibniz, and Machin)


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