anonymous
  • anonymous
The question is: identify each number as prime or composite. (A) 321 (B) 87 (C) 93 (D) 53 (E) 105 and (F) 1,072 Please explain the process. I'm sure if I can get the process of (A) I will know the rest. :)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Directrix
  • Directrix
We need some definitions. Definition: A prime number is a whole number with exactly two integral divisors, 1 and itself. The number 1 is not a prime, since it has only one divisor. So the smallest prime numbers are: 2, 3, 5, 7, ... The number 4 is not prime, since it has three divisors (1, 2, and 4), and 6 is not prime, since it has four divisors (1, 2, 3, and 6).
anonymous
  • anonymous
ok
Directrix
  • Directrix
Is 321 a prime number? The number of prime numbers is infinite so you are not expected to memorize them. :) See if you can find a number that divides 321.

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anonymous
  • anonymous
how would you go abouts trying the find number that goes into 321? would I divide something into 321?
Directrix
  • Directrix
Yes, I usually start with 2, 3, and then 5.
anonymous
  • anonymous
Ok. :) so like divide 2 into 321? Then do I have to see if it comes out evenly?
anonymous
  • anonymous
From Mathematica: { 321, 87 , 93, 53 , 105 , 1072} // PrimeQ {False, False, False, True, False, False}
Directrix
  • Directrix
Yes. If that does not work, try 3. (Too bad I can't delete the interloper's post. Bad manners on his part. Just ignore it for now.)
anonymous
  • anonymous
Thank you! Will do. lol! :)
Directrix
  • Directrix
Click on the blue DRAW button and show the division of 3 into 321. We're not finished. Because the interloper posted answers does not mean that you know the process or that he does either, for that matter.
anonymous
  • anonymous
ok. :) Just a min..
anonymous
  • anonymous
|dw:1332363235007:dw|
anonymous
  • anonymous
Sorry thats so messy..lol! Its weird trying to write on here.
Directrix
  • Directrix
You should see my writing on that pad. It's good to have though. So, 331 is composite. Do you agree?
anonymous
  • anonymous
Yes! Because 3 can go into 331 evenly.
Directrix
  • Directrix
Okay, how about 87 ?
anonymous
  • anonymous
|dw:1332363566894:dw| This would be composite because 3 goes into 87 evenly right?
Directrix
  • Directrix
Yes. One technical note: To say that 3 goes into 87 an even number of times - I know what you mean by that. But, the quotient of 29 is an odd number. So, let's say that 3 goes into 87 a whole number of times. If you want to sound like an expert, you can say that 3 " divides" 87 which means 3 goes into 87 an integer number of times.
anonymous
  • anonymous
Oh ok I see. :) Thank you so much for the really good help. Thats the kind of help I need I dont just want to know the answers I wan't to understand the process to apply to any other similar problems so I can understand and learn them. :)
anonymous
  • anonymous
I have to go for now. Thank you so much!
Directrix
  • Directrix
And, especially, I don't want answers spewed out from a program when I don't know how to do the process. Now, you check 93 and 105 for divisors. I'll do 53 and 1072.
Directrix
  • Directrix
I thought you wanted to do another problem.
anonymous
  • anonymous
Could I maybe ask for help later? I have to go. :)
Directrix
  • Directrix
Okay. Sorry about the intrusion.
anonymous
  • anonymous
No its ok. :)
anonymous
  • anonymous
From the "interloper", who provided the answers and not the solution method. How to check if a number is prime: Have patience, the following link is a little slow to load: http://www.lessonplanspage.com/mathprimevscompositenumbers7hs-htm/ http://www.wikihow.com/Check-if-a-Number-Is-Prime

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