The GCF of 90 and 180 is 90.
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No, their GCF is always odd.
The GCF of 36, 54 and 73 is 1.
There are infinitely many such pairs of numbers. As long as the only primes they have in common are 2×3²×5 (the prime factorization of 90) their gcf will be 90: Some examples: 90, 180 90, 270 90, 360 180, 270 180, 450 450, 630 630, 990
3 and 30