The highest common factor of the given numbers is 1
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You need at least two numbers to find a GCF.
The GCF is 3.
The greatest common factor of 18 21 and 42 is 3.
yes it is because 3 goes into 18 6 times - 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
The GCF of 21 and 90 is 3.