307. The Guinness World Record of the Longest Paper Chain

The Guinness World Record

of the

Longest Paper Chain

By - H A R I N I

It all started in math class, when Mr. E announced that we were making a paper chain. He added that we only had 25 minutes to make the chain! My group quickly brainstormed ideas and got to work. We decided to give jobs to people and after 10 minutes we would rotate jobs. By the end of 25 minutes, my group had 250 inches long. Mr. E said that if we wanted to do the project at home, we could, and he said  to look up the longest Guinness world record.

As soon as I reached home, I got out my supplies and made a paper chain that was about 175 inches long (445 cm, 15ft, 4.45m), in under 30 minutes! After giving it some thought, I decided to decorate my front door by placing the rainbow paper chain around it, and it looks like a fun birthday party!! I guess that the whole idea of the project is to introduce the conversion of units, for example, from inches to centimeter etc. (1 m = 100 cm; 1 in = 2.54 cm).

I researched the Guinness world record and it was held by Julie McKinney, who’s paper chain had been 779.21 m (2,556 ft 5.5 in) long was done in under 12 hours.
Source: http://www.guinnessworldrecords.com/

Not only was this project fun, it taught me and my friends about converting units like, inches, centimeters, meters, etc.

291. Pi Not Pie

Pi (𝝅) Not Pie

Harini Senthilkumar

Pi. Pi is a series of never ending numbers, and it is not easy to memorize. When Mrs. Hill, our fifth-grade teacher, said that it was Pi Day, almost everyone said “Huh?”  Mrs. Hill told us that Pi is a mathematical constant, and its value is 3.14… Pi is the ratio of a circle's circumference to its diameter. She said that we are going to memorize at least 10 numbers. She gave us the paper with the first 500 digits of Pi. Mrs. Hill said that we can't memorize the digits until we get home. Mrs. Hill also told us that Pi is used to calculate the area (𝜋r2) and circumference (2𝜋r) of a circle.

It is also used to calculate the volume of spherical objects. She also explained that Pi is celebrated in March 14th, because March is the third month, and the date is 14, the first three digits of Pi!! She added that a famous scientist, Albert Einstein, (known for the theory of relativity, and the equation, E=mc2), was born on Pi day. She further said that another famous scientist, Stephen Hawking (famous for the book: A Brief History of Time) passed away on Pi Day. I waited until school is over and the second I got home, I started memorizing numbers.

3.1415926535... Oh boy. I counted how many numbers I knew, and it was wait, 119, 120, 121! I knew 121 digits of Pi! The next day at school, we started the game. Mrs. Hill gave us a piece of paper and told us to write how many digits we have memorized. I picked up my pencil, and began writing. I finished and handed it to Mrs. Hill. To take the tension off the game, she took us to play Dodgeball.

After a couple of rounds, we went back in the classroom. Mrs. Hill held the paper and said, that I had memorized 121 digits!! When I got home, I researched Pi, and got some fun facts. For example, did you know that Lu Chao recited 67,890 digits!! Almost everyone knows Pi, but do they know who discovered it? William Jones, invented Pi in 1706. Pi has 2.7 trillion digits in approximation.

239. Roman Numeral

Roman Numeral	Number
I	1
V	5
X	10
L	50
C	100
D	500
M	1000

236. Math - Formulae

1. Area of a rectangle: 

     Length x Width

2. Area of a Square: 

      a²

3.  Circle:

     Area:  π r ²

     Circumference:  2 π r

    Sphere:

    Surface Area: 4 π r ²

   Volume: 4/3 π r ³