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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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โˆ™ 2017-01-14 00:42:23
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โˆ™ 2015-10-30 01:13:03

This has multiple solutions. Any multiples of 90, "90a" and "90b", such that "a" and "b" are relatively prime (have no common factors).

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Q: What two numbers have 90 as their gcf?
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