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When looking for a factors of a composite number how do you know you have found the right answer?
Wiki User
∙ 13y ago
List them all, and multiply to see if you get the original number.
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∙ 13y ago
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Is 98 prime or composite and why?
A number which has more than two factors is called composite number. 98 is a composite number because it has more than two factors. Factors of 98: 1, 2, 7, 14, 49 and 98. In order to prove that a number is composite try to find a factor other than 1 and the number itself: Since 98 is an even number so it is divisible by 2, so 2 is one of the factors of 98. For now we know three factors of 98: 1, 2 and 98. So, 98 is a composite number since we have found more than two factors.
Does every composite number only have two prime factors?
no, because a composite number can be found by multiplying three prime numbers. 3*2*5 = 30, and 30 is a composite number and also has 3 prime factors. Every prime number has 1 prime factor by the way, itself. 1 is neither prime nor composite.
How do you do prime and composite numbers?
to find a prime number, you need to find the factors for the numbers. once you have found the factors, you can determine which are prime. if the number only has 2 factors,1 and itself, it is prime. all other numbers are composite, except for 1. 1 is special. 1 only has one factor, 1.
What is the greatest composite number ever found?
It has not, will not and cannot be found.
Do you need to know all the factors of a number to decide if its prime or composite?
No. If the number has one factor (other than 1 and itself) it is a composite. However, to establish that a number is prime it needs to be checked for divisibility by each prime number up to the square root of the number. If the only factor found is 1, then it is a prime.
Can LCM be found by composite numbers?
Not normally because the LCM of numbers are found by multiplying their highest prime factors
What are the composite factors of 216297and 486?
3, 9, and 27 are the shared factors The shared composite factors will have the same prime factors. You just need to find the common prime factors and then the composites of those are the composite factors. Found this by looking at the prime factors first of 486: 2*3*3*3*3*3 Then of 216297 3*3*3*8011 I'm not sure if 8011 is prime, but it doesn't really matter - the remaining prime factors of 486 (2, 3, 3) don't go in to it. The common prime factors are 3, 3, 3 so the shared composites are the various multiples, in this case, 3,9, and 27.
How do you know when you've found all the factors of a number?
If you multiply all the prime factors you've found together and the result is the number, you have found all of them.
How do you know if a number is a composite number?
There is no simple answer. You need to check for divisibility by every number from 2 up to its square root. There are some simple rules for checking for divisibility by small numbers. As soon as you have found one such factor you know that it is a composite number.The fact that it is so difficult to tell is why composite numbers made up of two large primes are used for data encryption.
How do you know you found all factors to a number?
How to know that you found all the factors for example my teacher taught me that when u reach a double diget number that is all the factors. ( 6x6)-~ double diget number
What is the difference between finding the factors of a number and finding the prime factors of a number?
No difference. Once you've found the factors of a number, the prime numbers on that list are the prime factors.
Is 189 a prime or composite number?
189 is a composite. Some quick tests, which can be done in your head: Check if the number is even (2 is a factor). Ones place will have 0,2,4,6, or 8 if even. Multiple of 5 (5 is a factor): Ones digit is 0 or 5. Multiple of 3 or 9: Add up the digits in the number; if this sum is 3 or a multiple of 3, then the original number is a multiple of 3 (3 is a factor). Additionally, if this sum equals 9 or a multiple of 9, then 9 is a factor. This is the case for 189 : 1+8+9=18, which is a multiple of 9. Since we found a factor (in addition to 1 & the original number) then the number is composite and not prime.
