The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
The greatest common factor of 1 and 100 is 1
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There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
110= 2x5x11 275= 5x5x11 Therefore, Greatest Common Factor = 5x11 = 55
The factors of 174 are:1, 2, 3, 6, 29, 58, 87, 174The factors of 204 are:1, 2, 3, 4, 6, 12, 17, 34, 51, 68, 102, 204The common factors are:1, 2, 3, 6The Greatest Common Factor (GCF) is:6
1100
1100 = 1 x 1100 1100 = 2 x 550 1100 = 4 x 275 1100 = 5 x 220 1100 = 10 x 110 1100 = 11 x 100 1100 = 20 x 55 1100 = 22 x 50 1100 = 25 x 44
The factors of 110 are: 1, 2, 5, 10, 11, 22, 55, 110.The factors of 120 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120.The common factors are: 1, 2, 5, 10.The Greatest Common Factor (GCF) is: 10