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The GCF is 10.
The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40 The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70
The common factors of 40 and 70 are 1, 2, 5, 10
The least common multiple of the numbers 30, 40 and 70 is 840.
The GCF is 1.