There are ways, but not easy ones.
The simpler is to go, very systematically, through all numbers from 2 to the number that you are trying to factorise. Skip numbers only if THEIR factors are not factors of your number.
The other is to use prime factorisation. Any number can be broken down into a unit set of factors, some of which may feature more than once.
For example, suppose your number is 72. Its prime factorisation is
72 = 2*2*2*3*3 = 23*32
Here you have 2 different prime factors, the first (= 2) appears 3 times and the second (= 3) appears twice. Remember that 2 and 21 are the same.
Calculate all numbers of the form 2x3y where x = 0,1,2,3 and y = 0,1,2. The indices x and y go from 0 to the number of times the prime appears in the factorisation. This set of numbers, 2x3y, will be a complete list of all the factors of your number.
All factors of a number n will be factors of any multiple of n. All multiples of a number n will be multiples of any factor of n.
1,2,4,8,16,32,64,128,256,512
As 23 is a prime number, it has only two factors, the number one and itself. The factors of 23 are: 1 23 The prime factors are: 23 is a prime number.
Factors are numbers you can multiply together to get another number. Therefore, all the factors of 21 are as follows: 1,3,7,21.
I'm not too sure but i think that 1 and 10 are both factors. 100 as well.
Once all the prime factors of a number have been found, the number of factors the number has and what they are can be found. I'd be finding the prime factors first before finding all the factors of a number, so I'd rather find all the prime factors as it means I can stop before I have to do more work in finding all the factors.
First, make sure all the factors are, in fact, prime. Then make sure that the product of all the factors is the number you wanted to factor.
Do you mean all the factors? I'm not sure what "common factors" is?
Sure, just tell me what the numbers are.
I'm pretty sure the answer would be 1,2,4,16 (:
Not sure what you are asking? Factors in -99, or all the number 1 through 100. Please resubmit with some clarification.
All numbers have factors or can be factors, so I'm not sure what you mean by a number that is not a factor. There is a GCF for every set of nonzero integers, even if it's only 1.
"Proper factors" are all of a number's factors except one and the number itself.
All the factors of the number 11 are: 1 and 11. This is because 11 is a prime number.
All factors except the number itself or unity are "proper factors", the excluded ones being tautological.
No.
47 has no proper factors. It is a prime number so its only factors are 1 and itself.Not sure about facters, but the factors are 1 and 47.