Prime or Composite Numbers

9/17/2010

 
How do you know if a number is really prime?
sukhpreet link
9/17/2010 06:06:00 am

sukhpreet link
9/17/2010 06:08:18 am

i know if a number is prime if it has no other factors other than one and itself. that is how i tell if a number is prime. but if it has three or more factors it is a composite .

Abid
9/17/2010 06:38:30 am

I know that prime numbers are prime because every prime number cant have more than two factors: 1 and itself. I also know that prime numbers are always uneven.

savitoj
9/17/2010 06:42:07 am

I know the a number is prime because prime number can not have more than two fatcor. The only factors of prime numbers are 1and itself

lovepreet g. 807
9/17/2010 07:29:53 am

mr.dobbie i am trying to access questons 12-15 to see them but it is not opening other links that r jpg open only, what the problem

Mr. Dobbie
9/17/2010 09:09:44 am

Ok. So, you know how to define composite and prime numbers. How do you check to see if a number is a prime number? Let say....167. How can you prove it is/is not prime? What should you do first?

Mr. Dobbie
9/17/2010 09:11:47 am

Lovepreet, I've attached a link to download an Adobe Reader. Download and install the viewer on your computer, then try to open pg. 12 to 15. You should be able to do it without any problem. Otherwise, there may be something else wrong with your computer/security settings?

Parth
9/17/2010 09:15:44 am

Mr.dobbie i can't find yesterdays 1,2,3 etc activities posted on the class 807. So what sahould i do?
Is it for hom,ework or not?

savitoj
9/17/2010 10:24:23 am

the first step to check if a number is prime is to see if it is divisible by 2,3 or 5,

Naman
9/18/2010 02:39:42 am

you know that a number is prime if it has only 2 factors 1 and itself if it has more than 3 factors then it is a composite number (example 24 is composite because 1 2 4 6 8 12 and 24 are all factors of 24 a prime number like 7 has only 1 and itself as a factor.

Murwarid 806
9/19/2010 02:59:08 am

Mr.Dobbie,
for the weekends homework ... do we only have to do the practice sheet or pages 12-15 aswell?

Murwarid
9/19/2010 02:59:51 am

^^^ for now im only doing the practice sheet :)

Joshua Hamilton 807
9/20/2010 08:07:20 am

I am having trouble downloading adobe reader and getting pages 12 to 15 so what should I do.

Japreet 807
9/21/2010 08:41:26 am

you know that a number is prime because it can't be divided by 2,3,5 and any other prime number smaller than the number.

Twinkle806
9/21/2010 10:18:25 am

mr.dobbie
do we have the problem of the week to do for homework???

mr dobbie link
9/23/2010 06:48:21 am

is pages 1.3, 1.4,1.5 are homework. i am just asking because everyone was asking questions about it.

siddharth goyal link
9/23/2010 07:01:13 am

SORRY MR DOBBIE I WORTE NAME By accident i worte ur name

Simran M 807
9/24/2010 06:09:54 am

You know if a number is really prime if it has no factors to it. For example, the number 11; it can be divides by 11 and 1, nothing else. To check if this is true, you divide it by 2,3,5 and any even number less than the number itself. If the the number was 17 and you needed to know if it was prime, you'd wouldn't divide it by two because it is a odd number. 1+7 is equaled to 8, which is not a multiple of 3, meaning 3 isn't a factor of it either. You wouldn't check 5 because any multiple of 5 ends in a five or 0. Next you would have to check all even number under 17. No even number is divisable, meaning 17 is a prime number.

Parmeet link
10/4/2010 04:36:46 am

I know that a number is prime if it has 2 factors. Those factors are 1 and itself.compisite number have 3 or more factors. ( ex. 6's factors are 1,3,2,6) this is composite. ( ex. 7's factors are 1 and 7.) This is prime. That is how you know a number is prime.

Avinash 806
10/4/2010 04:37:11 am

This is how you make sure a number is prime. If the number only has two factors 1 and itself.

Alexander 806
10/4/2010 04:37:14 am

I know when a a number is prime when it cannot get divided by 2, 3, and 5 and if not do any number smaller than the number

Pavan 806
10/4/2010 04:38:28 am

you know a number is a prime number when the number can only be divided by 1 and itself.

Pawanpreet 806
10/4/2010 04:39:51 am

I know if a number is prime because it does not have more than 2 factors and it's factors are 1 and itself.

I'm pretty sure I don't have to pick I rubric for this but if I do than please tell me

Murwarid 807
10/4/2010 04:44:11 am

I know if a number is prime because,
if i divide the number by all the possible factors, and observe that it only has 2 factors (1 and itself) ...
then it is really prime.

sunjit806
10/4/2010 04:45:37 am

i kmow a number is a prime number when there is no other factor than 1 and itself example 17 the factors are one 17 therefore 17 is a prime number

Sabreena 806
10/4/2010 06:38:51 am

To know if a number is prime or not we need to identify any factors. If the only factors of that number are 1 and itself that means the number is a prime number. If it does have another factor the number isn't prime it is a composite number.

Example,
3, the only factor of 3 is 1 and itself (3) it has no more factors which means 3 is a prime number.

Renu 806
10/4/2010 07:18:44 am

To know if a number really is prime you would have to see if the number has any other number that it can be divided into. Any number that is even isn't a prime number because it can be divided by two so you know that it's not a prime number it's a composite number. A number is only prime if there is no other numbers it can be divided into except one and itself.


Example: 5 is a prime number because it has no other factors but 5(itself) and 1. Which means that 5 is a prime number.


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