Greatest: 856
Smallest: 1
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The greatest common factor must be a factor of the smallest number. The smallest number is 7. Its factors are 1 and 7. So the greatest common factor must be either 1 or 7. Since 7 is the larger of the two factors, check whether it is a factor of the additional numbers. Since it is, 7 is the greatest common factor.
The largest of the common factors of numbers is known as the greatest common divisor or greatest common denominator. The smallest common factor is called the lowest common divisor.
45x3=135 45x10=450 3 is a the smallest (prime) number that is a factor of 135 and 450 so the greatest common divisor is 45.
smallest=1234 greatest=4321
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