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The Number

The Number. 80. By Reshma Rajagopalan. Why I Chose. Eighty. I chose the number 80 because it is a big number that has lots of interesting facts. 80. Take Quiz. The Factor Game.

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The Number

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  1. The Number 80 By Reshma Rajagopalan

  2. Why I Chose Eighty • I chose the number 80 because it is a big number that has lots of interesting facts. 80 Take Quiz

  3. 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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Take Quiz

  4. 5 1 2 8 1 40 4 Different Kinds of Numbers • A composite number is a number that has factors other than 1 and itself. Eighty is a composite 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 is a number that ends in 0, 2, 4, 6, or 8. Eighty is an even number Take Quiz

  5. Factors of 80 • 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 Take Quiz

  6. 1 by 18 2 by 40 4 by 20 5 by 16 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. 8 by 10

  7. 80 2 40 2 2 20 2 2 2 10 2 2 2 2 5 Prime Factorization of 80 • The prime factorization of 80 is 2x2x2x2x5 or 2 x5 4 Take Quiz

  8. Culture • In Chinese culture, the number 8 and any number containing 8 is considered to be lucky This is how 80 is written in Mandarin:

  9. 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 Take Quiz

  10. Quiz Time!!!

  11. Question 1 80 is an abundant number( click on the correct answer) True False Back to Slide Show Next Question

  12. Question 2 I-80 the second longest ___ in America?(click on the correct answer) I-80 is the second longest highway I-80 is the second longest interstate It is the second longest road Back to Slide Show Previous Question Next Question

  13. Question 3 True or False: Eighty is not a composite number. (click on the correct answer) True False Back to Slide Show Previous Question Next Question

  14. Question 4 Is the beach in Western Australia called The 80 or 90 Mile Beach? (click on the correct answer) The 80 Mile Beach The 90 Mile Beach Back to Slide Show Previous Question Next Question

  15. Question 5 What are the proper factors of 80? (click on the correct answer) 1,2,4,5,8,10,16,20,40 and 80 1,2,4,5,8,10,16,20 and 40 1,2,3,4,5,8,10,16,20 and 40 Back to Slide Show Previous Question Next Question

  16. Question 6 How many factor pairs does 80 have? (click on the correct answer) 4 5 Back to Slide Show Previous Question

  17. Thanks For Watching Take Quiz

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