The factors of 126 are:
1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126
The factors of 144 are:
1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
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The greatest common factor of 126 and 144 is 18. The prime factorization of 126 is 2*3*3*7. The prime factorization of 144 is 2*2*2*2*3*3 The GCF of 2*3*3 = 18
There are no common factors of 126 because there cannot be common factors without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, and 126. The prime factors of 126 are 2, 3, 3, and 7. Examples: The common factors of 4 and 126 are 1 and 2. The common factors of 36 and 126 are 1, 2, 3, 6, 9, and 18. The common factors of 49 and 126 are 1 and 7. The common factors of 12, 30, and 126 are 1, 2, 3, and 6.
The factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126.
Common factors of 126 and 28 are: 1, 2, 7, and 14.
Here are the first 10: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180 . . .