A factor is a divisor - a number that will evenly divide into another number.
One way to determine the common factors is to find all the factors of the numbers and compare them.
The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.
The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90.
The common factors are 1, 2, 3, 5, 6, 10, 15, and 30.
This means that the greatest common factor is 30.
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The greatest common factor (GCF) of 45, 60, and 90 is 15. To find the GCF, you need to determine the common factors of the numbers and then identify the greatest one they all share. The factors of 45 are 1, 3, 5, 9, 15, and 45. The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90. The greatest common factor among them is 15.
19 and 90 have no common prime factors.
One way to determine the common factors is to find all the factors of the numbers and compare them. The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90. The common factors are 1, 2, 3, 5, 6, 10, 15, and 30. This also means the greatest common factor is 30.
The common factors of 42 and 60 are: 1, 2, 3, and 6
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 30, 60, 75, and 90 is 15.