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The least common denominator of any two integers is 1. To see this, convert the integers to fractions so they actually have denominators.
5 = 5/1
15 = 15/1
The denominators are both 1, so they are already common. 1 cannot be reduced, so they are already least. So, the LCD of 5 and 15 is 1.
You may have intended to ask about the least common multiple, which makes more sense for integers. For this, list the multiples of each number, and find the lowest number in both lists.
5 = 5, 10, 15, 20, 25
15 = 15, 30, 45, 60, 75
The lowest number in both lists is 15, and so 15 is the lowest common multiple (LCM) of 5 and 15.
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What is the least common denominator of 3 and 5?
The Least Common Multiple of 3 and 5 is 15, which would be the denominator to use for fractions with the denominators 3 and 5.
What is the least common denominator of 15 5 12 and 2?
60
What is the least common denominator of the fractions 1 over 15 and 2 over 5?
It is 15.
What is the least common denominator of 12 and 5?
The least common denominator is 60.
What is the least common denominator for 3 and 5?
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. If those numbers are denominators, the LCD is 15.
