Wednesday, 7 January 2015

Key Takeaways for Lesson 1 (8 Jan)

Post as comments, three key learning points from the lesson.

28 comments:

  1. 1. 2 is the only even prime number
    2. 1 is not a prime because if it is divided by itself the outcome is still 1
    3. The sieve of Eratosthenes is the most efficient way of finding prime numbers

    ReplyDelete
    Replies
    1. It actually can find numbers bigger than 100 as well, just that you need much more time to find them.

      Delete
  2. 1.A prime number is a number that can only be divided by itself and one.
    2.A composite number is a number that can be divided by itself, one and other numbers.
    3.The sieve of Eratosthenes is the most efficient way of finding small prime numbers.

    ReplyDelete
  3. 1. A prime number is a number that can only be divided by itself and 1
    2. A composite number is a number that isn't a prime number.
    3. The sieve of Eratosthenes is the most efficient way of finding small prime numbers

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    Replies
    1. Regards to 2. explain in terms of factors.

      Delete
  4. 1. A prime number is a number is only divisible by 1 and itself
    2. 1 is not a prime as it can only be divided by itself and no other number
    3. The sieve of Eratosthenes is the best way to find prime number

    ReplyDelete
  5. 1.2 is the only even prime number
    2.1 is not a prime number as it is only divisible by itself and no other number
    3.an interger greater than 1 is called a prime number if its only positive divisor factors are 1 and itself

    ReplyDelete
    Replies
    1. It's integer, Zhi Heng.
      "only positive factors" are 1 and itself.

      Delete
  6. 1. prime numbers must have two factors which are 1 and the number itself
    2. 1 is not a prime number as it can only be divided by 1
    3. 2 is the only even prime number as it can only be divided by 1 and 2

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  7. 1. Prime numbers must only have 2 factors which are 1 and the number itself
    2. 2 is the only even prime number
    3. 1 is not a prime number because it has only 1 factor, which is 1

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  8. 1. A prime number is divisible by itself and one only
    2. There are many prime numbers
    3. 2 is the only even prime number

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  9. 1. '2' is the only prime number that is an even number.
    2. A prime number can only be divisible by '2' and itself.
    3. '1' is not a prime number as it can only be divided by '1', which is itself.

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  10. 1. A prime number is an integer that can only be divided by 1 and itself.
    2. We can use a method called 'The Sieve of Eratosthenes' to find out what integers are prime numbers and which ones are not.
    3. 1 is not a prime number.

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  11. 1. A prime number can be divisible by itself and number 1
    2. 1 is not a prime number
    3. We can find Prime numbers using 'The Sieve of Eratosthenes'

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  12. 1.The only even prime number is 2.
    2. 1 and 0 are both special number which are neither prime nor composite number.
    3.The Sieve of Eratosthenes is a way of finding prime numbers.

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  13. 1.a prime number is a number that can only be devided by one or itself
    2.0 is not a prime
    3.2 is the only even prime number

    and i found these somewhere :
    1) Every prime above 3 is always 1 number away from a multiple of 6.
    2) For primes bigger than 3 again; if you square a prime and take 1 away from this; the answer is always divisible by 24.
    3) Any prime number above 2 is the difference of two squares of two other integers....(as is the case for any odd number)

    4) Think of a number; double it. There's at least one prime number in between these two numbers.

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  14. 1. All prime numbers are odd numbers except 2.
    2. If we add two prime numbers together (except for 2), the answer will be an equal number as the sum of two odd numbers is an even number.
    3. We can use methods like 'The Sieve of Eratosthenes' to aid us in finding prime numbers faster.

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  15. 1. All prime numbers can only be divided by 1 and itself.
    2. All prime numbers are above 1.
    3. Methods such as 'The Sieve Of Eratosthenes' can be used to figure out prime numbers easier.

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  16. 1. 2 is the only even prime number.
    2. Not all odd numbers are prime numbers.
    3. 1 is not a prime number as it has only 1 factor.

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  17. 1. 2 odd numbers add up to an even number
    2. A prime number can only be divided by one and itself
    3. The number one is not a prime number

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  18. 1. 2 is the smallest prime number
    2. Adding 2 prime numbers produces an even numbers
    3. A prime number only has 1 factor

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  19. 2 is the only even prime number
    a prime number is a number that is only divisible by itself and 1
    not all odd number are prime number

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  20. 1. The opposite of prime numbers are composite numbers
    2. 0 and 1 are not prime numbers
    3. A prime number is a number that can only be divided by 1 or itself

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  21. 1. Prime numbers are numbers can only be divisible by 1 or itself
    2. 0 and 1 are NOT Prime Numbers
    3. The opposite of prime numbers are composites

    ReplyDelete