1 x 405, 3 x 135, 5 x 81, 9 x 45, 15 x 27
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To find two numbers that multiply together to equal 405, we can start by finding the prime factorization of 405, which is 3 x 3 x 3 x 3 x 3 x 5. From this, we can see that the two numbers are 27 and 15, as 27 x 15 = 405.
313
-19
23
8.31 comes closest.