Well, darling, if we're talking about a number that goes into both 3 and 5, the answer is 1. Technically, 1 is a factor of every number, so it fits the bill. But if you were looking for something more exciting, I'm afraid you're out of luck.
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One.
As 3 and 5 are Prime numbers, no other number will go evenly into them. (presuming that "evenly" means a multiple of two). If you are looking for a common factor of 3, 4, and 5, then the answer is 1.
5 and 7 are prime numbers. and 3 goes into 9, so the only number that goes into 5, 7, and 9 is 1. They are what we call "relatively prime", even though 9 is not prime, because they have no common factors other than 1.
The only number that goes into both 3 and 4 is 1.