The Amazing Number 28

By:Young Joong Kim

Why I Chose This Number

• I chose this number because it was the first number to come to my head when Ms. Maggie asked us to pick a number or she’d chop our tongues off and serve it as tongue stew for her cats…I just thought that any number would have a history and meaning in religions so why think when it can just come to your head?!?!

INVESTIGATION 1 UNIT PROJECT.

• My special number is the number 28. 28 is on the board for the Factor Game and the Product Game, but it would be the second worst first move for the Factor Game because although your opponent has done nothing, you would give them the same points as you since 28 is a Perfect number. It is one of the best first moves in the Product Game though, because 28 is on the middle of the game board and you’ll have more choices for your next move.

IVESTIGATION 2 UNIT PROJECT.

• My number is a composite number and has 1.) 1,28

2.)2,14 3.)4,7. 3

Factor pairs and 6 factors.

My number is an even number.

THE SECRETS OF 28 IN SCIENCE

• The atomic number of a nickel(A slivery white metal)• The fourth Magic number(In nuclear physics, Magic

numbers are numbers of nucleons and protons)• The planet Saturn revolves around the Sun in

approximately 28 years• Years normally follow a 28 year cycle, since there

are 7 days a week and leap years occur every 4 years, a calendar from 28 years ago would be the same as this year’s.

FACTS ABOUT 28 IN MATH 28 has 6 factors: 1,2,4,7,14,28

• 1*28=28 2*14=28 4*7=28

• 28 is a composite and even number• The two digits added together =10

• Its multiples up to 112 are: 28, 56, 84, 112

• Its factors are: 28, 14, 7, 4, 2, 1

The Prime Factorization of 28

2

-----28

Exponents: I

28

11

28

2

-----14

I I

14

2

7-----7

I I

7

4

1 I I

4

7

Other Facts About 28

• It is the last day of February in a normal year.

• My trash can cost 28RM

• In the Prime Time book, there are 28 words in the Glossary describing the word, factor(without the * and = sign).

From Here A Quick Quiz

• Name one thing about 28 that relates to Science.

• 28 is a number that can kill you.• It takes 28 years for Saturn to revolve

around the Sun.• 28 is the # of great luck in Japanese• If you say, “the number 28, you will have

bad luck for the rest of your life

Wrong!!!! Try Again Or Give UP! (Please Just Try Again)

CORRECT!! YAY! Now Let’s go on.

Wrong……Try Again

Wrong. So…Is This Too Hard?

More Facts About # 28

• 28 is a Perfect number (The proper factors add up to the number itself).

• 28 is part of the Title of the movie,”28 Weeks Later”

• September 28 is the 271st day of the year. There are 94 days remaining.

• February 28 is the 59th day of the year There are 306 days remaining * 28 Is NOT a square number. The closest it can get

to being a square number is 7*4.

28’s Dimensions and Factor String

• 1*28 / 28*1

• 2*14 / 14*2

• 4*7 / 7*4

• 28

• 14 7

• 7*2*1*7

How to Write/Say 28 In Roman, and Other Countries

• Roman: XXVIII

• Chinese: Er Si Ba

• Korean: Yi Ship Pal

• Japanese: Ni Ju Hachi

• Malaysian: Dua Blas Umppat

BORING IS IT? WELL LET’S SEE IF YOU WERE

LISTENING!• How do you say 28 in Korean?(Korean

people please be quiet).

• Yi Sahl Pi

• Ya Ship Po

• Yi Ship Pal

• Yi Sham Pal

Glossary

• Composite Number = A number that can have a number be divided evenly into it.

• Factors = numbers that “fit” evenly into another number.

• Factor Pairs = Pairs of factors that are multiplied by each other to get their multiple(not necessarily the LCM). Factor pairs give dimensions of a rectangle, the width and the length are the factors.

• Proper Factors = All of the factors of a number other than itself.

Glossary 2

• Saturn = A planet in our galaxy that is the 6th planet farthest from the planet.

• Multiple = The product of a given number and another whole number.EG: 2*3=6. 6 is a multiple of 2 and 3.

• Prime Factorization = A product of prime numbers, perhaps with some repetitions, resulting in the desired number. Your Prime Factorization should end up with all numbers prime.