There's no work. Since 3 is a factor of all three numbers, it is automatically the GCF.
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Since 10 is a factor of 30, it is automatically the GCF.
The GCF of 18 and 30 is 6
The greatest common factor for 12, 18, and 30 is 6. The factors of 12 are 1, 2, 3, 4, 6, and 12 The factors of 18 are 1, 2, 3, 6, 9, and 18 The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30 Thus, GCF (12, 18, 30) = 6
The GCF is 3.
30