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The GCF is 18.
18.
The GCF is 21.
42
The GCF is 6.
90/126 is 5/7 in its lowest terms
The GCF of 54, 90, and 126 is 9
The GCF is 18. The LCF is 1.
18 and 630 respectively
The GCF is 126.