Anything that isn't 1, 3, 5, 15
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The greatest common factor of 15,45, and 90 is 15.
The greatest common factor of 90 , 30 , 45 = 15
The GCF of 30, 45, and 90 is 15. One way to approach this is to look at the difference between 30, 45, and 90. The difference between 30 and 45 is 15. The difference between 45 and 90 is 45. The greatest common factor cannot be larger than the smallest difference between the numbers and must be a factor of the difference. The smallest difference is 15. Since 30, 45, and 90 are divisible by 15, the greatest common factor is 15.
The GCF of 45 and 90 is 45Definition: 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 the numbers have in common.Method: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 45 are 1, 3, 5, 9, 15, and 45.The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90.The common factors are 1, 3, 5, 9, 15, and 45. Therefore, the greatest common factor is 45.
10 is not.