15, 30, 45, etc.
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Any multiple of 2700
75 can be evenly divided by 1, 3, 5, 15, 25, and 75. 15 can be evenly divided by 1, 3, 5, and 15.
45 can be divided evenly by 1, 3, 5, 9, 15, and 45.
To simplify 5/15, we can divide both the numerator and denominator by their greatest common factor, which is 5. So, 5 divided by 5 is 1, and 15 divided by 5 is 3. Therefore, the simplest form of 5/15 is 1/3.
Prime numbers are those numbers that can only be divided evenly by 1 and themselves. For example 7 cannot be divided evenly by 2, 3, 4, 5, or 6. It is prime. On the other hand 9, can be divided evenly by 3. Therefore it is not prime.