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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

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8y ago

What else can I help you with?