You need at least two numbers to find something in common. If that's 7 and 10, the LCD is 70.
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It is possible for two fractions to have many common denominators. The smallest of these is the LCD.
It is not possible to give a sensible answer to this question. The smallest or least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question!
the least common denominator
The least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least denominator for a number is itself.
143