no because the GFC has to be equal to or less than the lowest number
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The GCF is 2.
The GCF is 18.
The mistake is that there is a greater common factor than 18. It's 36. 36 divides 36 evenly. 36 divides 72 evenly.
The GCF is 18.
90 = 18 x 5 36 = 18 x 2 Since 90 and 36 are both divisible by 18, the GCF is 18.