The Number

The NumberThe Number

By Reshma Rajagopalan

Why I Chose

I chose the number 80 because it is a big number that has lots of interesting facts.

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The Factor Game

80 would be a bad number to start the factor game with because it has a lot of factors. This means it’s abundant

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Different Kinds of Numbers A composite numberA composite number is a

number that has factors other than 1 and itself. Eighty is a composite number

An abundant number An abundant number is a number whose Proper Factors add up to more than itself. Eighty is an abundant number because its Proper Factors add up to 108

An even number An even number is a number that ends in 0, 2, 4, 6, or 8. Eighty is an even number

11

55

22

88

1

44

4400

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Factors of 80

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The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80

80’s proper factors are 1, 2, 4, 5, 8, 10, 16, 20, and 40

80 has 5 factor pairs: 1 and 80, 2 and 40,

4 and 20, 5 and 16, 8 and 10

Different Ways to Make 80

There are different ways to make 80 by using rectangle models. The dimensions of each model would be one of 80’s factor pairs.

1 by 181 by 18 2 by 402 by 40 4 by 204 by 20

5 by 5 by 1616

8 by 108 by 10

Prime Factorization of 80

The prime factorization of 80 is 2x2x2x2x5 or 2 x5

4

8080

2 40

2 2 20

22

2 2 10

22 22 22

2

55

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Culture

In Chinese culture, the number 8 and any number containing 8 is considered to be luckyThis is how 80 is written in Mandarin:

The World of 80

In 80 AD the original Roman Pantheon was destroyed in a fire

There’s a beach in Western Australia called The 80 Mile Beach

In America, the second longest interstate is I-80

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Question 1

80 is an abundant number( click on the correct answer)

TrueFalse

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Question 2

I-80 the second longest ___ in America?(click on the correct answer)

I-80 is the second longest highwayI-80 is the second longest interstate

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It is the second longest road

Question 3

True or False: Eighty is not a composite number. (click on the correct answer)TrueFalse

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Question 4

Is the beach in Western Australia called The 80 or 90 Mile Beach? (click on the correct answer)The 80 Mile BeachThe 90 Mile Beach

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Question 5

What are the proper factors of 80? (click on the correct answer)

1,2,4,5,8,10,16,20 and 401,2,4,5,8,10,16,20,40 and 80

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1,2,3,4,5,8,10,16,20 and 40

Question 6

How many factor pairs does 80 have? (click on the correct answer)

5 4

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