There is only one common factor of 3, 4 and 5 which is 1.
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Since the only variable, "x", is not a common factor, you just need to calculate the common factor of the numbers.In this case, you might start with the smallest number, check whether it's a factor of the others. If it is, that's the answer; if it isn't, the greatest common factor will be one of the factors of this smallest number.
The greatest common factor of the numbers 3, 4, 8 and 9 is 1.
4 3 and 6 have no proper factor in common. Remember that 1 is a factor of every counting number, but not a proper factor of any of them. Greatest common factor questions do not recognise 1 as a proper factor. When talking of primes neither 1 nor the number itself is regarded as a proper factor.
You can factor out a 7 making it 3 and 4.
The greatest common factor of 12 and 52 is 4. 52/4 = 13 12/4 = 3