The common factors are: 1, 2, 3, 5, 6, 10, 15, 30.
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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.
19 and 90 have no common prime factors.
The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90 The factors of 135 are 1, 3, 5, 9, 15, 27, 45, and 135 The common factors of 90 and 135 are 1, 3, 5, 9, 15, and 45
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.
The GCF of 30 and 90 is 30.