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You need at least two numbers to find a GCF.
The greatest common factor that is possible for two numbers between 40 and 50 would be 10 if both 40 and 50 are allowed, since 50 - 40 = 10. If only the numbers from 41 to 49 are allowed, the difference is 8, so 8 would be the largest possible common factor, but neither 41 nor 49 are divisible by 8, so that situation does not exist. However, 42 and 49 are both divisible by 7, which is their greatest common factor.
A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 32 are 1, 2, 4, 8, 16, and 32. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80. The common factors are 1, 2, 4, and 8. Therefore, the greatest common factor is 8.
These numbers are -12 and -8.
A number that is a factor of two or more numbers is simply a common factor